# Placardset, full reference text > Every guide and the FAQ from https://placardset-web.pages.dev, converted from the published pages at build time. The short index is at https://placardset-web.pages.dev/llms.txt. Hazmat awareness practice # ERG practice scenarios, graded step by step A tanker shows a placard and an orange panel. Which class is it, which guide, how far do you isolate, and what do you do first? Placardset gives you the scenario, shows the tables the way the 2024 guidebook prints them, and marks every step with the page it comes from. ## One scenario, start to finish A placard with the POISON GAS design and an orange panel reading 1017, a cylinder leaking slowly, at night. Here is the lookup the drill grades: - **Class.** The bottom corner of the placard reads 2 and the word is POISON GAS: Division 2.3, toxic gases. - **Guide.** In the yellow section, page 29, 1017 is Chlorine, Guide 124, and the row is highlighted in green. - **Distance.** Green sends you to Table 1. Table 1, small spill: isolate 60 m in all directions, then protect 1.5 km downwind at night. - **First actions.** From Guide 124: keep people upwind and out of low areas, keep combustibles away, and fight any fire with water only. The common miss is reading the wrong column. Type the day figure for a night scenario and the drill says so: "Protect: night gives 1.5 km; you wrote 0.3. That is the day column." And when the ID number is on the vehicle, the placard table is the wrong tool. A class 3 placard would send you to Guide 127, but 1203 is Gasoline, Guide 128. The drill names that trap: "127 is the placard table's guide for this placard. With an ID number, use the yellow index instead: 1203 is Guide 128." Training aid only. In a real incident follow the current printed guidebook and your employer's emergency plan. Daily drill Five scenarios a day, the same for everyone on the same date. Free. UN number lookup 2,771 yellow index rows, 522 highlighted, each with its page. Free. Practice by class and timed runs A set for any one hazard class, or ten ID numbers against the clock. Projection for a class One scenario on the big screen, answers on your cue, a printed key. ## Where the numbers come from Every guide number, highlight, distance and page is typed in from the public 2024 Emergency Response Guidebook and checked twice: the yellow index against the blue index row for row, and each Table 1 row against the book's own text. Every graded step cites the page, so a trainee can open the printed book and see the same line. Placardset is a training aid; in a real incident follow the current printed guidebook and your employer's plan. Any name you type, for a certificate or a class, stays in this browser. Nothing is uploaded. There is no account and nothing to install. ## Frequently asked questions ### What is Placardset? A practice tool for hazmat awareness trainees and their instructors. A scenario shows a placard, an orange panel or a shipping paper line; you name the class, find the guide number, read the distance and pick the first actions, and each step is graded with the page it comes from. ### Is it free? Yes. Everything on the site is free, with no account. ### Where does the data come from? From the 2024 Emergency Response Guidebook (ERG2024), typed in from the public English PDF on 2026-09-27: the whole yellow index (2,771 rows), every guide's immediate precautionary distance, the placard table, and the 41 Table 1 rows on printed pages 290 and 291. Hazard classes come from the Hazardous Materials Table, 49 CFR 172.101. The guidebook may be reproduced without further permission; no government name or seal is used as an endorsement. ### Can I use this during a real incident? No. It is a training aid. In a real incident follow the current printed guidebook and your employer's emergency plan. --- Guide # Emergency Response Guidebook guides for trainees The guidebook is used in one order: identify the material (an ID number, a name or at least a placard), find its orange guide, check whether its entry is highlighted in green, and read either Table 1 or the guide for the first distance, then the guide for what to do first. These guides walk each step with examples worked by the same data the drill grades against. ## The four parts of the book you will use The yellow section lists materials by their four digit ID number: 2,771 rows in the 2024 edition, on printed pages 29 to 86. The blue section lists the same materials by name. Both give a three digit guide number, and 522 of the yellow rows are highlighted in green. The orange section holds the 62 guides themselves, each two pages: hazards, public safety and evacuation on the left, fire, spill and first aid on the right. The green section holds Table 1, the initial isolation and protective action distances for the highlighted entries. ## The lookup, in one example A cylinder is leaking at night, and the orange panel reads 1017. Page 29 of the yellow section gives Chlorine, Guide 124, and the row is green. Table 1, small spill: isolate 60 m in all directions, then protect 1.5 km downwind at night. Then Guide 124 gives the first actions. Every guide below takes one part of that path and slows it down. ## Every guide - [How to use the guidebook](https://placardset-web.pages.dev/guide/how-to-use-the-emergency-response-guidebook/): the lookup path from an ID number, a name or a placard to the orange guide and Table 1, step by step. - [Placard classes explained](https://placardset-web.pages.dev/guide/placard-classes-explained/): the nine hazard classes and their divisions, with our own drawing of every placard and its placard table guide. - [UN numbers and guide numbers](https://placardset-web.pages.dev/guide/un-numbers-and-guide-numbers/): what the four digit ID number means, how the yellow and blue sections map it to a guide, and the P suffix. - [Isolation and protective action distances](https://placardset-web.pages.dev/guide/initial-isolation-and-protective-action-distances/): reading Table 1: small and large spills, day and night, Refer to Table 3, and the guide distance for materials not highlighted. - [Reading shipping papers](https://placardset-web.pages.dev/guide/reading-shipping-papers/): the parts of a hazardous materials shipping description and how each one leads into the guidebook. - [Hazmat awareness class drills](https://placardset-web.pages.dev/guide/hazmat-awareness-class-drills/): a four lesson plan for awareness level instructors using projection, class sets and the timed lookup run. ## How the drill fits in Reading about the lookup is not the same as doing it fast. The [daily drill](https://placardset-web.pages.dev/drill/) gives five scenarios a day and grades the class, the guide, the distance and the first actions separately, so you can see which step you keep missing. The [UN number lookup](https://placardset-web.pages.dev/lookup/) searches the whole yellow index when you only want to check a number. Instructors can put any scenario on a screen with [projection mode](https://placardset-web.pages.dev/projection/). Everything in these guides is paraphrased from the 2024 Emergency Response Guidebook and checked against it. It is written for training. In a real incident the current printed guidebook and your employer's plan come first. ## Sources Checked on 27 September 2026. Everything here is said in our own words; the guidebook's text is paraphrased, never quoted at length. Where your instructor, your employer's plan or the current printed guidebook says something different, follow them. - **2024 Emergency Response Guidebook, How to Use This Guidebook (printed page 1) and User's Guide (pages 344 to 349).** The lookup order: ID number to the yellow section, name to the blue section, placard to the placard table, then the orange guide and, for highlighted entries, Table 1; opened 27 September 2026. - **2024 Emergency Response Guidebook, yellow section (printed pages 28 to 87).** The ID number index and its introduction, including the green highlighting and the P suffix; opened 27 September 2026. - **2024 Emergency Response Guidebook, Introduction to Green Tables and Table 1 (printed pages 280 to 333).** Small and large spills, day and night, and Refer to Table 3; opened 27 September 2026. - **Placardset's grader.** Every example on this page is computed by the drill's own data and grading at build time, and pinned by a test. ## Frequently asked questions ### Where should a trainee start? With how to use the guidebook, then placard classes, then the daily drill. Table 1 and shipping papers come next, once the page turn to the yellow section is quick. ### Do I need my own copy of the guidebook? It helps, because the point is to find the page in the book you will carry. The drill shows the tables it grades, so you can also practise without one. ### Which edition does Placardset use? The 2024 edition. The guidebook is normally revised every four years, so the next one is expected around 2028; the data will be re-entered then. --- Step by step # How to use the Emergency Response Guidebook Find the material's four digit ID number, look it up in the yellow section to get a three digit guide number, and check whether the entry is highlighted in green. If it is green and nothing is burning, read Table 1 for the isolation and protective action distances; if it is not, use the orange guide's immediate precautionary distance. Then read the orange guide for what to do first. ## The steps - **Stay back.** Approach from upwind, uphill or upstream, keep people away, and do not walk into a spill, vapor or smoke while you read placards from a distance. - **Identify the material.** Look for the four digit ID number on a placard, an orange panel or the shipping paper. If there is no number, use the name from the shipping paper; if there is neither, use the placard. - **Find the guide number.** Look the ID number up in the yellow section, or the name in the blue section. With only a placard, use the placard table on printed pages 8 and 9. With nothing at all, use Guide 111. - **Check the green highlight.** If the entry is highlighted in green and there is no fire, go to Table 1 for the initial isolation and protective action distances, and still read the guide. - **Read the orange guide.** Turn to the guide number. Its left page gives the hazards, public safety and evacuation, including the immediate precautionary isolation distance; its right page gives fire, spill and first aid. - **Call for help.** Call 911 or your local number, then the emergency response telephone number on the shipping paper, and report what you found. ## Worked example: a chlorine leak at night A cylinder on a flatbed is leaking slowly from a cracked valve. It is night. An orange panel on the truck reads 1017. Here is the path through the 2024 guidebook, exactly as the [daily drill](https://placardset-web.pages.dev/drill/) grades it. - The ID number is known, so the yellow section is the right tool. On printed page 29, 1017 is Chlorine, Guide 124. - The row is highlighted in green, and nothing is burning, so the distances come from Table 1, not from the guide. - A leak from one cylinder is a small spill: a small package, or a small leak from a large one. Table 1, small spill: isolate 60 m in all directions, then protect 1.5 km downwind at night. In feet and miles: Table 1, small spill: isolate 200 ft in all directions, then protect 0.9 mi downwind at night. - Had the whole tank been open, the large spill columns apply, and for chlorine they do not give a number: Table 1 says "Refer to Table 3" for a large spill of Chlorine. - Guide 124 then gives the first actions: stay upwind and out of low areas, keep combustibles away, and water only on any fire. ## When you have a name but no number The blue section lists the same entries by name in alphabetical order, with the guide number and the ID number beside each one. It is the way in when a shipping paper or a package label gives a name you can read but the number is hidden or damaged. The two sections carry the same 2,771 entries; the only difference is the order. ## When all you have is a placard The placard table on printed pages 8 and 9 gives one guide per placard design, for use only when neither the number nor the name is known. It is a starting point, not an answer. A class 3 FLAMMABLE placard points to Guide 127; the moment the number turns out to be 1203, the yellow section sends you to Guide 128 instead. If nothing can be identified, or the DANGEROUS placard is shown on a mixed load, the table points to Guide 111. ## Common mistakes - Walking closer to read a placard. Binoculars and the wind at your back are the guidebook's first advice. - Using the placard table when an ID number is visible. The number is always more specific. - Missing the green highlight and using the guide's distance for a material that belongs in Table 1. - Reading the day column at night, or the large spill columns for a small leak. - Stopping at Table 1. The orange guide still gives the fire, spill and first aid actions. - Using the book for a mixed load of several materials, which the flowchart says to avoid. ## Practise it The [daily drill](https://placardset-web.pages.dev/drill/) gives five scenarios like this one every day, and the [UN number lookup](https://placardset-web.pages.dev/lookup/) lets you check any number. For the distances in detail, read [isolation and protective action distances](https://placardset-web.pages.dev/guide/initial-isolation-and-protective-action-distances/). ## Sources Checked on 27 September 2026. Everything here is said in our own words; the guidebook's text is paraphrased, never quoted at length. Where your instructor, your employer's plan or the current printed guidebook says something different, follow them. - **2024 Emergency Response Guidebook, How to Use This Guidebook (printed page 1) and User's Guide (pages 344 to 349).** The lookup order: ID number to the yellow section, name to the blue section, placard to the placard table, then the orange guide and, for highlighted entries, Table 1; opened 27 September 2026. - **2024 Emergency Response Guidebook, yellow section (printed pages 28 to 87).** The ID number index and its introduction, including the green highlighting and the P suffix; opened 27 September 2026. - **2024 Emergency Response Guidebook, Table of Markings, Labels and Placards (printed pages 7 to 9).** The placard table and its initial guides, for use only when the ID number and name are unknown; opened 27 September 2026. - **2024 Emergency Response Guidebook, orange section (printed pages 148 to 279).** The guides, including each guide's Evacuation section with its immediate precautionary measure; opened 27 September 2026. - **2024 Emergency Response Guidebook, Introduction to Green Tables and Table 1 (printed pages 280 to 333).** Small and large spills, day and night, and Refer to Table 3; opened 27 September 2026. - **Placardset's grader.** Every example on this page is computed by the drill's own data and grading at build time, and pinned by a test. ## Frequently asked questions ### What if more than one hazardous material is involved? The guidebook's own flowchart says not to use it in that case: call the emergency response number on the shipping paper or the numbers in the back of the book. ### What does the P after a guide number mean? That the material may polymerize violently under some conditions, such as heat or contamination. The guide page is the same number without the P. ### Should I use Table 1 if the material is on fire? No. With a fire, the orange guide's evacuation distance comes first; Table 1 is then used downwind for any material still being released. ### Does the placard table give the same guide as the ID number? Not always. The placard table gives a general guide for the class, and the ID number gives the specific one. When the ID number is known, it wins. --- Reference # Hazmat placard classes explained A placard tells you the hazard class of what a vehicle carries, not the exact material. Read the number in the bottom corner first: it is the class, from 1 for explosives to 9 for miscellaneous. The colour and symbol confirm it. Only when there is no ID number and no name does the placard alone choose the guide, from the placard table on printed pages 8 and 9. ## The placard chart These are our own drawings, made from simple shapes in the ordinary colours each class uses. They are for practice. The guide shown under each one is the placard table's initial guide. **Division 1.1 EXPLOSIVES**Explosives with a mass explosion hazardPlacard table guide 112 **Division 1.2 EXPLOSIVES**Explosives with a projection hazard but no mass explosion hazardPlacard table guide 112 **Division 1.3 EXPLOSIVES**Explosives with a fire hazard and a minor blast or projection hazardPlacard table guide 112 **Division 1.4 EXPLOSIVES**Explosives that present no significant hazardPlacard table guide 114 **Division 1.5 BLASTING AGENTS**Very insensitive explosives with a mass explosion hazardPlacard table guide 112 **Division 1.6 EXPLOSIVES**Extremely insensitive articles with no mass explosion hazardPlacard table guide 114 **Division 2.1 FLAMMABLE GAS**Flammable gasesPlacard table guide 118 **Division 2.2 NON-FLAMMABLE GAS**Non-flammable, non-toxic gasesPlacard table guide 120 **Division 2.2 OXYGEN**Oxygen, compressed or refrigeratedPlacard table guide 122 **Division 2.3 POISON GAS**Toxic gasesPlacard table guide 123 **Class 3 FLAMMABLE**Flammable liquids (and combustible liquids in the United States)Placard table guide 127 **Division 4.1 FLAMMABLE SOLID**Flammable solids, self-reactive substances and solid desensitized explosivesPlacard table guide 134 **Division 4.2 SPONTANEOUSLY COMBUSTIBLE**Substances liable to spontaneous combustionPlacard table guide 136 **Division 4.3 DANGEROUS WHEN WET**Substances that give off flammable gases in contact with waterPlacard table guide 139 **Division 5.1 OXIDIZER**Oxidizing substancesPlacard table guide 143 **Division 5.2 ORGANIC PEROXIDE**Organic peroxidesPlacard table guide 148 **Division 6.1 POISON**Toxic substancesPlacard table guide 153 **Division 6.1 INHALATION HAZARD**Toxic substances that are toxic by inhalationPlacard table guide 153 **Division 6.2 INFECTIOUS SUBSTANCE (label)**Infectious substances; there is no placard, only this labelPlacard table guide 158 **Class 7 RADIOACTIVE**Radioactive materialsPlacard table guide 163 **Class 8 CORROSIVE**Corrosive substancesPlacard table guide 153 **Class 9**Miscellaneous dangerous goods and articlesPlacard table guide 171 **DANGEROUS**A mixed load of two or more classesPlacard table guide 111 ## The nine classes - **Class 1, explosives.** 1.1: explosives with a mass explosion hazard; 1.2: explosives with a projection hazard but no mass explosion hazard; 1.3: explosives with a fire hazard and a minor blast or projection hazard; 1.4: explosives that present no significant hazard; 1.5: very insensitive explosives with a mass explosion hazard; 1.6: extremely insensitive articles with no mass explosion hazard. - **Class 2, gases.** 2.1: flammable gases; 2.2: non-flammable, non-toxic gases; 2.3: toxic gases. - **Class 3, flammable liquids.** Flammable liquids (and combustible liquids in the United States). - **Class 4, flammable solids.** 4.1: flammable solids, self-reactive substances and solid desensitized explosives; 4.2: substances liable to spontaneous combustion; 4.3: substances that give off flammable gases in contact with water. - **Class 5, oxidizers and organic peroxides.** 5.1: oxidizing substances; 5.2: organic peroxides. - **Class 6, toxic and infectious substances.** 6.1: toxic substances; 6.2: infectious substances. - **Class 7, radioactive materials.** Radioactive materials. - **Class 8, corrosives.** Corrosive substances. - **Class 9, miscellaneous.** Miscellaneous dangerous goods and articles. ## Reading a placard Start at the bottom corner. A red placard with a flame could be class 2 (a flammable gas) or class 3 (a flammable liquid); the corner number settles it. Divisions share the class number: a green NON-FLAMMABLE GAS placard, a red FLAMMABLE GAS placard and a POISON GAS placard all show 2. Then read the word, where there is one, and the symbol. The POISON GAS and POISON INHALATION HAZARD placards have a black upper corner with the skull in white, which is the quickest way to spot a material that is toxic by inhalation. Toxic by inhalation is not only a Division 6.1 matter. A material whose entry in the Hazardous Materials Table carries an inhalation hazard special provision, whatever its class, also takes the POISON INHALATION HAZARD placard beside its class placard (49 CFR 172.505), unless that placard is already POISON GAS or POISON INHALATION HAZARD. Anhydrous hydrogen fluoride, UN1052, is class 8: a bulk load shows CORROSIVE and POISON INHALATION HAZARD together, and the drill draws both. The class is still 8. Two colours on one placard mean a specific division. White over red is 4.2, spontaneously combustible. Red over yellow is 5.2, organic peroxide. Yellow over white is 7, radioactive. White over black is 8, corrosive. Seven red stripes on white is 4.1, flammable solid. ## Worked example: a placard and nothing else A trailer shows an orange EXPLOSIVES placard marked 1.1. There is no shipping paper and no number, and there cannot be one: explosives are not listed by ID number in the guidebook, and the rules forbid an ID number on an EXPLOSIVES placard. The placard table sends divisions 1.1, 1.2, 1.3 and 1.5 to Guide 112, and its Evacuation section says to isolate at least 500 m (1/3 mile) in all directions as an immediate precaution. Divisions 1.4 and 1.6 go to Guide 114 instead. ## Numbered placards and orange panels On bulk loads the four digit ID number may be shown across the middle of the placard, in place of the word, or on an orange panel beside it. That number is worth more than the placard: it takes you to the yellow section and the exact guide for the material. The [UN numbers guide](https://placardset-web.pages.dev/guide/un-numbers-and-guide-numbers/) explains what to do with it. ## Common mistakes - Reading the class from the colour alone. Red is class 2, 3 and part of 4 and 5. - Treating a subsidiary placard as the main one. The primary class is the one the numbered placard or shipping paper names first. - Expecting a placard on every load. Small shipments of many classes need no placard at all, so the absence of one proves nothing. - Using the placard table's guide after an ID number has been found. Practise one class at a time in [practice by class](https://placardset-web.pages.dev/practice/), or try today's mixed set in the [daily drill](https://placardset-web.pages.dev/drill/). ## Sources Checked on 27 September 2026. Everything here is said in our own words; the guidebook's text is paraphrased, never quoted at length. Where your instructor, your employer's plan or the current printed guidebook says something different, follow them. - **2024 Emergency Response Guidebook, Hazard Classification System (printed page 6).** The nine classes and their divisions; opened 27 September 2026. - **2024 Emergency Response Guidebook, Table of Markings, Labels and Placards (printed pages 7 to 9).** The placard table and its initial guides, for use only when the ID number and name are unknown; opened 27 September 2026. - **49 CFR 172.504, general placarding requirements, tables 1 and 2, and 172.505, placarding for subsidiary hazards (eCFR text as of 1 September 2026).** Which placard each class takes, the DANGEROUS placard for mixed loads, no placard for Division 6.2 (opened 27 September 2026), and the POISON INHALATION HAZARD placard added for any material toxic by inhalation (172.505(a), opened 28 September 2026). - **49 CFR 172.334, identification numbers, prohibited display (eCFR text as of 1 September 2026).** No ID number on RADIOACTIVE, EXPLOSIVES, DANGEROUS or subsidiary hazard placards; opened 27 September 2026. - **Placardset's grader.** Every example on this page is computed by the drill's own data and grading at build time, and pinned by a test. ## Frequently asked questions ### Where is the class number on a placard? In the bottom corner. The colour and symbol help, but the number in the bottom corner is the class or, for classes with divisions, the class the division belongs to. ### Why is there no placard for infectious substances? The U.S. placarding tables list no placard for Division 6.2. Packages carry the infectious substance label, which is what the guidebook's table shows. ### What does the DANGEROUS placard mean? A vehicle carrying packages of two or more classes may show one DANGEROUS placard instead of one placard per class. The placard table sends it to Guide 111. ### Can an ID number go on any placard? No. The regulations forbid an ID number on RADIOACTIVE, EXPLOSIVES, DANGEROUS and subsidiary hazard placards, so those scenarios in the drill carry no number. --- Reference # UN numbers and guide numbers explained The four digit ID number (a UN number, or an NA number in North America) identifies the material. The guidebook's yellow section lists every ID number in order with a three digit guide number beside it, from 111 to 174; that guide is the orange page to read. The same lookup works by name in the blue section. ## What is in the yellow section In the 2024 edition the yellow section runs from printed page 29 to page 86 and holds 2,771 rows for 1,983 different ID numbers. Each row is an ID number, a guide number and a name of material. 522 rows are highlighted in green, which means the material also has a row in Table 1. The 62 guides the numbers point to are in the orange section. One number can have many rows. ID 1075, for example, appears 9 times, as Butane, Butylene, Isobutane, Isobutylene, Liquefied petroleum gas, LPG, Petroleum gases, liquefied, Propane, Propylene, all with Guide 115. Scan every row for your number before you move on, because a name can change whether the row is green. ## Worked example: the number beats the placard A cargo tank shows a class 3 placard with 1203 across the middle. The placard alone would point to Guide 127 in the placard table. The yellow section, page 32, says 1203 is Gasoline, Guide 128, not highlighted. So the guide is 128, and the first distance is its immediate precautionary measure: Guide 128's immediate precautionary measure: isolate at least 50 m in all directions. Entering 127 in the drill gets this feedback: "127 is the placard table's guide for this placard. With an ID number, use the yellow index instead: 1203 is Guide 128." ## The P after a guide number Some rows print a P after the guide, as 1040 Ethylene oxide does with Guide 119P. The P warns that the material may polymerize violently, for example when heated or contaminated. The guide page itself is the number without the P. In the drill, a guide typed without its P is still right, with the note: "The index prints 119P. The P warns that the material may polymerize violently; the guide page is still 119." ## IDs with more than one guide Almost every ID number maps to a single guide, but not all. In this edition 4 ID numbers send different names to different guides: 1057 (Guides 115, 128); 3166 (Guides 115, 128); 3171 (Guides 138, 147, 154); 3536 (Guides 138, 147). For these the name decides the guide, so read the whole row. Placardset's timed lookup run leaves them out, because it shows only the number. ## Where the numbers come from The ID number, the proper shipping name and the hazard class all come from the regulations' hazardous materials table, and they appear together on the shipping paper. The guidebook adds the guide number and the green highlight. Placardset's drill set takes its classes from that table and its guides from the yellow section, and a test checks that each name is printed in the index with the same guide. ## Common mistakes - Stopping at the first row for an ID number when the next row, with a different name, is green. - Reading the guide number as a page number. - Mixing up neighbouring numbers: 1017 and 1071 are both gases with different guides. - Dropping the P and forgetting the polymerization warning it carries. Check any number with the [UN number lookup](https://placardset-web.pages.dev/lookup/), or race the clock in the [timed lookup run](https://placardset-web.pages.dev/practice/). ## Sources Checked on 27 September 2026. Everything here is said in our own words; the guidebook's text is paraphrased, never quoted at length. Where your instructor, your employer's plan or the current printed guidebook says something different, follow them. - **2024 Emergency Response Guidebook, yellow section (printed pages 28 to 87).** The ID number index and its introduction, including the green highlighting and the P suffix; opened 27 September 2026. - **2024 Emergency Response Guidebook, orange section (printed pages 148 to 279).** The guides, including each guide's Evacuation section with its immediate precautionary measure; opened 27 September 2026. - **Hazardous Materials Table, 49 CFR 172.101 (eCFR text as of 1 September 2026).** The hazard class and subsidiary hazards of every material in the drill set; opened 27 September 2026. - **Placardset's grader.** Every example on this page is computed by the drill's own data and grading at build time, and pinned by a test. ## Frequently asked questions ### What is the difference between a UN number and an NA number? Both are four digit ID numbers. UN numbers are international; NA numbers are North American numbers for materials that have no UN number, and the guidebook lists both in the same yellow section. ### Why does one ID number have several names? One number often covers a family of materials or several names for the same one, so the index repeats the number once per name. They usually share one guide. ### Is the guide number a page number? No. Guides are numbered 111 to 174 and each takes two pages in the orange section. Find the guide by its number printed at the top corner of the page. ### Can I trust a guide number from memory? Look it up every time. Several common materials sit next to each other in the index with different guides, and the drill is built to train the lookup, not memory. --- Table 1 # Isolation and protective action distances in the guidebook For a green highlighted entry with no fire, Table 1 gives two distances: first isolate the area in all directions, then protect people downwind by evacuating or sheltering in place. Choose the small or large spill columns, then day or night. For an entry that is not highlighted, use the immediate precautionary distance in the orange guide's Evacuation section instead. ## How to read the table - **Confirm the entry is green.** Only entries highlighted in green in the yellow or blue section have a Table 1 row. For the rest, use the guide's immediate precautionary distance. - **Find the row.** Table 1 is in ID number order. Find the ID and check the name, because some materials have one row for a land spill and another for a spill into water. - **Choose the spill size.** A small spill is a small package or a small leak from a large package; a large spill is a large package or many small ones. - **Read the isolation distance.** The first figure in the chosen columns is how far to isolate the area in all directions. - **Read the protective action distance.** Then choose day or night and read how far downwind people should be protected, by evacuating or sheltering in place. ## Worked example: chlorine 1017 Chlorine is highlighted on page 29 of the yellow section, and its Table 1 row is on printed page 290. For a small spill: isolate 60 m (200 ft), then protect 0.3 km (0.2 mi) downwind by day or 1.5 km (0.9 mi) at night. For a large spill the row says Refer to Table 3. A trainee who reads the day figure for a night leak gets this from the drill: "Protect: night gives 1.5 km; you wrote 0.3. That is the day column." ## Worked example: phosgene, the large night figure For 1076 Phosgene, a large spill means isolating 500 m and protecting 9.5 km downwind at night, against 2.5 km for a small spill. On the two Table 1 pages Placardset carries, the largest night figure is 1092 Acrolein, stabilized: 11.1 km (6.9 mi) after isolating 600 m. ## The rows Placardset carries The drill uses the 41 rows on printed pages 290 and 291 (33 ID numbers), typed in and checked against the book's own text. Every highlighted material in the drill set is among them, so the distance you are asked for is always in the table below. Rows that say Refer to Table 3 for a large spill: 1005, 1017, 1040, 1050, 1052, 1079. Table: Table 1, initial isolation and protective action distances (printed pages 290 and 291) | ID | Guide | Name of material | Small spill: isolate | Small: protect day | Small: protect night | Large spill: isolate | Large: protect day | Large: protect night | | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1005 | 125 | Ammonia, anhydrous | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.2 km (0.1 mi) | Refer to Table 3 | | 1005 | 125 | Anhydrous ammonia | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.2 km (0.1 mi) | Refer to Table 3 | | 1008 | 125 | Boron trifluoride | 30 m (100 ft) | 0.2 km (0.1 mi) | 0.7 km (0.5 mi) | 400 m (1250 ft) | 2.4 km (1.5 mi) | 4.7 km (2.9 mi) | | 1008 | 125 | Boron trifluoride, compressed | 30 m (100 ft) | 0.2 km (0.1 mi) | 0.7 km (0.5 mi) | 400 m (1250 ft) | 2.4 km (1.5 mi) | 4.7 km (2.9 mi) | | 1016 | 119 | Carbon monoxide, compressed | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.2 km (0.1 mi) | 200 m (600 ft) | 1.2 km (0.7 mi) | 3.9 km (2.4 mi) | | 1017 | 124 | Chlorine | 60 m (200 ft) | 0.3 km (0.2 mi) | 1.5 km (0.9 mi) | Refer to Table 3 | | 1026 | 119 | Cyanogen | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.4 km (0.3 mi) | 60 m (200 ft) | 0.3 km (0.2 mi) | 1.1 km (0.7 mi) | | 1040 | 119P | Ethylene oxide | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.2 km (0.2 mi) | Refer to Table 3 | | 1040 | 119P | Ethylene oxide with nitrogen | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.2 km (0.2 mi) | Refer to Table 3 | | 1045 | 124 | Fluorine, compressed | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.2 km (0.1 mi) | 100 m (300 ft) | 0.5 km (0.3 mi) | 2.3 km (1.4 mi) | | 1048 | 125 | Hydrogen bromide, anhydrous | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.2 km (0.2 mi) | 150 m (500 ft) | 1 km (0.7 mi) | 3.2 km (2 mi) | | 1050 | 125 | Hydrogen chloride, anhydrous | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.3 km (0.2 mi) | Refer to Table 3 | | 1051 | 117P | Hydrogen cyanide, stabilized | 60 m (200 ft) | 0.2 km (0.1 mi) | 0.7 km (0.4 mi) | 200 m (600 ft) | 0.7 km (0.5 mi) | 1.8 km (1.1 mi) | | 1052 | 125 | Hydrogen fluoride, anhydrous | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.5 km (0.3 mi) | Refer to Table 3 | | 1053 | 117 | Hydrogen sulfide | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.5 km (0.3 mi) | 400 m (1250 ft) | 2.4 km (1.5 mi) | 6.3 km (4 mi) | | 1053 | 117 | Hydrogen sulphide | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.5 km (0.3 mi) | 400 m (1250 ft) | 2.4 km (1.5 mi) | 6.3 km (4 mi) | | 1061 | 118 | Methylamine, anhydrous | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.2 km (0.1 mi) | 200 m (600 ft) | 0.6 km (0.4 mi) | 2.1 km (1.3 mi) | | 1062 | 123 | Methyl bromide | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.1 km (0.1 mi) | 150 m (500 ft) | 0.3 km (0.2 mi) | 0.7 km (0.5 mi) | | 1064 | 117 | Methyl mercaptan | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.3 km (0.2 mi) | 200 m (600 ft) | 1.3 km (0.8 mi) | 3.9 km (2.4 mi) | | 1067 | 124 | Dinitrogen tetroxide | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.4 km (0.3 mi) | 400 m (1250 ft) | 1.4 km (0.9 mi) | 3.3 km (2.1 mi) | | 1067 | 124 | Nitrogen dioxide | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.4 km (0.3 mi) | 400 m (1250 ft) | 1.4 km (0.9 mi) | 3.3 km (2.1 mi) | | 1069 | 125 | Nitrosyl chloride | 30 m (100 ft) | 0.2 km (0.2 mi) | 1 km (0.7 mi) | 800 m (2500 ft) | 4.3 km (2.7 mi) | 9.6 km (6 mi) | | 1076 | 125 | Phosgene | 100 m (300 ft) | 0.6 km (0.4 mi) | 2.5 km (1.6 mi) | 500 m (1500 ft) | 3 km (1.9 mi) | 9.5 km (5.9 mi) | | 1079 | 125 | Sulfur dioxide | 100 m (300 ft) | 0.6 km (0.4 mi) | 2.6 km (1.6 mi) | Refer to Table 3 | | 1079 | 125 | Sulphur dioxide | 100 m (300 ft) | 0.6 km (0.4 mi) | 2.6 km (1.6 mi) | Refer to Table 3 | | 1082 | 119P | Refrigerant gas R-1113 | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.1 km (0.1 mi) | 60 m (200 ft) | 0.4 km (0.3 mi) | 0.7 km (0.5 mi) | | 1082 | 119P | Trifluorochloroethylene, stabilized | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.1 km (0.1 mi) | 60 m (200 ft) | 0.4 km (0.3 mi) | 0.7 km (0.5 mi) | | 1092 | 131P | Acrolein, stabilized | 100 m (300 ft) | 1.3 km (0.8 mi) | 3.5 km (2.2 mi) | 600 m (2000 ft) | 6.8 km (4.2 mi) | 11.1 km (6.9 mi) | | 1093 | 131P | Acrylonitrile, stabilized | 30 m (100 ft) | 0.2 km (0.2 mi) | 0.6 km (0.4 mi) | 100 m (300 ft) | 1.3 km (0.8 mi) | 2.3 km (1.5 mi) | | 1098 | 131 | Allyl alcohol | 30 m (100 ft) | 0.2 km (0.1 mi) | 0.3 km (0.2 mi) | 60 m (200 ft) | 0.8 km (0.5 mi) | 1.2 km (0.8 mi) | | 1135 | 131 | Ethylene chlorohydrin | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.1 km (0.1 mi) | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.1 km (0.1 mi) | | 1143 | 131P | Crotonaldehyde | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.2 km (0.1 mi) | 60 m (200 ft) | 0.5 km (0.3 mi) | 0.7 km (0.5 mi) | | 1143 | 131P | Crotonaldehyde, stabilized | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.2 km (0.1 mi) | 60 m (200 ft) | 0.5 km (0.3 mi) | 0.7 km (0.5 mi) | | 1162 | 155 | Dimethyldichlorosilane (when spilled in water) | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.1 km (0.1 mi) | 30 m (100 ft) | 0.4 km (0.2 mi) | 1.2 km (0.8 mi) | | 1163 | 131 | Dimethylhydrazine, unsymmetrical | 30 m (100 ft) | 0.2 km (0.1 mi) | 0.5 km (0.3 mi) | 100 m (300 ft) | 1 km (0.7 mi) | 1.8 km (1.1 mi) | | 1182 | 155 | Ethyl chloroformate | 30 m (100 ft) | 0.2 km (0.1 mi) | 0.3 km (0.2 mi) | 60 m (200 ft) | 0.6 km (0.4 mi) | 0.9 km (0.6 mi) | | 1183 | 139 | Ethyldichlorosilane (when spilled in water) | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.1 km (0.1 mi) | 60 m (200 ft) | 0.5 km (0.3 mi) | 1.5 km (0.9 mi) | | 1185 | 131P | Ethyleneimine, stabilized | 30 m (100 ft) | 0.2 km (0.1 mi) | 0.5 km (0.3 mi) | 200 m (600 ft) | 1 km (0.6 mi) | 1.8 km (1.1 mi) | | 1196 | 155 | Ethyltrichlorosilane (when spilled in water) | 30 m (100 ft) | 0.1 km (0.1 mi) | 0.5 km (0.3 mi) | 150 m (500 ft) | 1.8 km (1.2 mi) | 3.7 km (2.3 mi) | | 1238 | 155 | Methyl chloroformate | 30 m (100 ft) | 0.2 km (0.2 mi) | 0.5 km (0.4 mi) | 150 m (500 ft) | 1.2 km (0.7 mi) | 2.2 km (1.4 mi) | | 1239 | 131 | Methyl chloromethyl ether | 60 m (200 ft) | 0.5 km (0.3 mi) | 1.5 km (1 mi) | 300 m (1000 ft) | 3.4 km (2.1 mi) | 5.7 km (3.6 mi) | ## Entries that are not highlighted Most entries are not green. For those, the first distance is in the orange guide, under Evacuation: an immediate precautionary measure to isolate the spill or leak area in all directions. Across the 62 guides the figures are: - 50 m for liquids, 25 m for solids: 24 guides - 100 m (330 ft): 17 guides - 50 m (150 ft): 10 guides - 25 m (75 ft): 10 guides - 500 m (1/3 mile): 1 guide For a large spill, most guides also say to consider a larger downwind evacuation, and with a fire, to isolate a tank or rail car for a much greater distance. ## Common mistakes - Reading the day column for a night incident, or the reverse. - Using the large spill columns for one leaking drum or cylinder. - Reading the feet or miles figure as meters or kilometers. - Taking the first row for an ID when the material is in water and has its own row. - Using Table 1 when the material is burning. Practise the columns in the [daily drill](https://placardset-web.pages.dev/drill/), which always shows the table, or look up any highlighted ID in the [UN number lookup](https://placardset-web.pages.dev/lookup/). ## Sources Checked on 27 September 2026. Everything here is said in our own words; the guidebook's text is paraphrased, never quoted at length. Where your instructor, your employer's plan or the current printed guidebook says something different, follow them. - **2024 Emergency Response Guidebook, Introduction to Green Tables and Table 1 (printed pages 280 to 333).** Small and large spills, day and night, and Refer to Table 3; opened 27 September 2026. - **2024 Emergency Response Guidebook, orange section (printed pages 148 to 279).** The guides, including each guide's Evacuation section with its immediate precautionary measure; opened 27 September 2026. - **2024 Emergency Response Guidebook, yellow section (printed pages 28 to 87).** The ID number index and its introduction, including the green highlighting and the P suffix; opened 27 September 2026. - **Placardset's grader.** Every example on this page is computed by the drill's own data and grading at build time, and pinned by a test. ## Frequently asked questions ### Why is the night distance larger? Air near the ground mixes less at night, so a toxic cloud stays concentrated farther downwind. Table 1 gives separate day and night columns for that reason. ### What does Refer to Table 3 mean? For large spills of six common toxic gases, the distance depends on the container and the wind, so Table 1 sends you to Table 3, which gives distances by container type and wind speed. ### What if the material is on fire? Use the orange guide's evacuation distances for the fire first. Table 1 is then used downwind for material still being released. ### Does Table 1 apply to every material? No. Only the green highlighted entries, which are toxic by inhalation or give off toxic gas in water. For the rest, the orange guide gives the immediate precautionary distance. --- Shipping papers # How to read a hazmat shipping paper A hazardous materials shipping description gives, in order, the ID number, the proper shipping name, the hazard class with any subsidiary hazards in parentheses, the packing group and the quantity, plus an emergency response telephone number that is monitored at all times. The ID number takes you to the yellow section of the guidebook; the name takes you to the blue section if the number is missing. ## The steps - **Find the paper.** On a truck it is in the cab, on a train with a crew member, on an aircraft with the pilot or crew, and on a ship in a holder on the bridge. - **Read the ID number.** The four digit number with UN or NA in front of it is the way into the yellow section. - **Read the proper shipping name.** If the number is missing or damaged, the name is the way into the blue section. Check that it matches a row for the ID number. - **Read the class.** The hazard class or division follows the name; any subsidiary hazards follow it in parentheses. - **Note the packing group and quantity.** The Roman numeral is the packing group, I for the greatest danger. The quantity tells you how big the spill could be. - **Find the emergency number.** An emergency response telephone number, monitored at all times, is printed with the description or once on the paper where it is easy to find. ## Worked example: a line with a subsidiary hazard This is one line in our own layout, the way the drill shows it: Shipping paper, hazardous materials ID number**UN1093** Proper shipping name**Acrylonitrile, stabilized** Class or division**3 (6.1)** Packing group**I** Quantity**1 load** - UN1093 is the ID number. On page 30 of the yellow section it is Acrylonitrile, stabilized, Guide 131P, and the row is highlighted in green. - The class reads 3 (6.1): a flammable liquid, class 3, that is also toxic, division 6.1. - Packing group I: the greatest degree of danger within its class. - Green means Table 1. For a small spill by day: Table 1, small spill: isolate 30 m in all directions, then protect 0.2 km downwind by day. Notice that the class alone would have sent you somewhere else: a class 3 placard points to Guide 127 in the placard table, while the ID number gives Guide 131P. The guide's P warns of polymerization. ## What the order tells you The regulations fix the order of the basic description: ID number, proper shipping name, class, packing group. Knowing the order lets you read a crowded or damaged paper quickly. The class may be written with the word Class or Division in front, and the packing group may be written with PG in front, as in PG II. A combustible liquid may show no class at all. ## The emergency response number Every hazardous materials shipment must carry a numeric emergency response telephone number, monitored the whole time the material is in transport, answered by someone who knows the material or can reach someone who does. It is printed right after the description, or once on the paper in a way that stands out. Calling it is one of the first actions in every orange guide. ## Common mistakes - Reading the quantity or a contract number as the ID number. The ID number has UN or NA in front of it. - Ignoring the subsidiary hazards in parentheses. - Taking the class from the placard when the paper names the material. The paper, through the ID number, is more specific. - Going into the cab of a leaking vehicle to fetch the paper without thinking about the hazard first. Shipping paper scenarios are part of the [daily drill](https://placardset-web.pages.dev/drill/). For what comes after the ID number, read [UN numbers and guide numbers](https://placardset-web.pages.dev/guide/un-numbers-and-guide-numbers/). ## Sources Checked on 27 September 2026. Everything here is said in our own words; the guidebook's text is paraphrased, never quoted at length. Where your instructor, your employer's plan or the current printed guidebook says something different, follow them. - **2024 Emergency Response Guidebook, Shipping Papers (inside front cover).** Where the shipping paper is kept and what it gives: ID number, proper shipping name, class, packing group and the emergency number; opened 27 September 2026. - **49 CFR 172.202, description of hazardous material on shipping papers (eCFR text as of 1 September 2026).** ID number, proper shipping name, class with subsidiaries in parentheses, packing group in Roman numerals, total quantity; opened 27 September 2026. - **49 CFR 172.604, emergency response telephone number (eCFR text as of 1 September 2026).** A monitored number on the shipping paper, reachable at all times the material is in transportation; opened 27 September 2026. - **Hazardous Materials Table, 49 CFR 172.101 (eCFR text as of 1 September 2026).** The hazard class and subsidiary hazards of every material in the drill set; opened 27 September 2026. - **Placardset's grader.** Every example on this page is computed by the drill's own data and grading at build time, and pinned by a test. ## Frequently asked questions ### Is shipping paper the same as a shipping document? Yes. The guidebook treats shipping papers and shipping documents as the same thing, and so does this site. ### What do the numbers in parentheses after the class mean? They are subsidiary hazards. A description reading 3 (6.1) is a flammable liquid that is also toxic, and the placards and guide reflect both. ### What is the packing group? A Roman numeral from I to III for the degree of danger within the class, I being the greatest. Some classes, such as explosives and radioactive materials, have none. ### What if the shipping paper and the placard disagree? Treat it as a warning sign, use the more cautious guide, and call the emergency response number. The drill never builds a scenario where they disagree. --- For instructors # Hazmat awareness class drills with the guidebook Awareness level trainees must be able to recognize and identify hazardous materials and understand the guidebook's role. The fastest way to build that is repeated lookups with feedback: project a scenario, let the class work it in their own books, reveal the answer with its page. This four lesson plan does that with Placardset's projection mode, class sets and timed runs. ## The plan - **Lesson 1, placards and classes.** Project a class set for class 2 and one for class 3. Stop on each placard and ask for the class before revealing it. Hand out the placard chart. - **Lesson 2, the yellow and blue lookup.** Give every trainee a printed guidebook. Run the timed lookup at the slowest pace together, then at a faster one, and compare guide numbers aloud. - **Lesson 3, Table 1.** Project scenarios with green highlighted materials only. Ask for the spill size and time of day before anyone opens the table. - **Lesson 4, full scenarios.** Trainees work the daily drill on their own devices, then the class works two projected scenarios from start to finish. Print certificates of practice for those who want one. ## What the drill set covers The drill set holds 68 materials with ID numbers and 8 placard only scenarios. A class set draws from one hazard class: - Class 1, explosives: 6 scenarios per set - Class 2, gases: 8 scenarios per set - Class 3, flammable liquids: 8 scenarios per set - Class 4, flammable solids: 5 scenarios per set - Class 5, oxidizers and organic peroxides: 5 scenarios per set - Class 6, toxic and infectious substances: 8 scenarios per set - Class 7, radioactive materials: 3 scenarios per set - Class 8, corrosives: 7 scenarios per set - Class 9, miscellaneous: 5 scenarios per set The daily drill mixes 5 scenarios and always includes at least one that needs Table 1 and one that does not. The timed run shows 10 ID numbers from anywhere in the yellow index, one every 30, 20, 15 seconds depending on the pace you choose. ## Running a projected scenario Choose the class set, type the class name if you want it on the printed key, and start. Each scenario shows a large placard, orange panel or shipping paper line and a short situation: a leaking cylinder at night, a tank truck on its side by day. Four questions sit beside it. Give the room a minute per question, then reveal. The answer names the class, the guide, the distance with its Table 1 row or guide page, and the first actions the guide supports. Use the previous and next buttons to revisit a scenario the room argued about. ## What to listen for - Trainees who reach for the placard table when an ID number is visible. - Trainees who read the large spill columns for one leaking package. - Day and night swapped, especially on the first Table 1 scenario of the day. - A guide typed without its P, and nobody asking what the P means. - Anyone who wants to walk closer to read a placard. ## Tracking practice Each trainee's results stay in their own browser. The [progress page](https://placardset-web.pages.dev/progress/) shows accuracy by step: class, guide, distance and first actions. A trainee can export a CSV to hand in, and print a certificate of practice. The certificate records practice only; it is not a training record under any regulation, and your course records remain your own. ## Common mistakes when teaching it - Letting the app replace the book. Have printed guidebooks in the room and make trainees find the page. - Revealing too fast. The lookup is the skill; give time to turn pages. - Teaching distances from memory. Numbers change between editions; the lookup does not. Start with [projection mode](https://placardset-web.pages.dev/projection/), or send trainees the [daily drill](https://placardset-web.pages.dev/drill/) as homework. ## Sources Checked on 27 September 2026. Everything here is said in our own words; the guidebook's text is paraphrased, never quoted at length. Where your instructor, your employer's plan or the current printed guidebook says something different, follow them. - **29 CFR 1910.120(q)(6)(i), first responder awareness level (eCFR text as of 1 September 2026).** The competencies an awareness level responder must be able to show, including an understanding of the guidebook's role; opened 27 September 2026. - **2024 Emergency Response Guidebook, How to Use This Guidebook (printed page 1) and User's Guide (pages 344 to 349).** The lookup order: ID number to the yellow section, name to the blue section, placard to the placard table, then the orange guide and, for highlighted entries, Table 1; opened 27 September 2026. - **2024 Emergency Response Guidebook, Introduction to Green Tables and Table 1 (printed pages 280 to 333).** Small and large spills, day and night, and Refer to Table 3; opened 27 September 2026. - **Placardset's grader.** Every example on this page is computed by the drill's own data and grading at build time, and pinned by a test. ## Frequently asked questions ### Do trainees need accounts? No. Everything runs in each browser with no sign up, and projection mode needs only the instructor's screen. Trainee names typed for a certificate stay in that browser. ### Does this replace the required training? No. It is a practice aid for the guidebook part of an awareness course. The course, its content and its records are the instructor's and the employer's. ### Can I print an answer key? Yes. Projection mode prints an answer key for the set on screen, with an optional class name at the top, from its own button. ### Will every trainee see the same daily scenarios? Yes. The daily set is chosen by the local date, so a class that meets on the same day can compare answers. --- FAQ # Questions about the ERG drills and the data Short answers. For the lookup itself, start with [the guide](https://placardset-web.pages.dev/guide/), or go straight to the [daily drill](https://placardset-web.pages.dev/drill/). ## Frequently asked questions ### What is Placardset? A practice tool for hazmat awareness trainees and their instructors. A scenario shows a placard, an orange panel or a shipping paper line; you name the class, find the guide number, read the distance and pick the first actions, and each step is graded with the page it comes from. ### Is it free? Yes. Everything on the site is free, with no account. ### Where does the data come from? From the 2024 Emergency Response Guidebook (ERG2024), typed in from the public English PDF on 2026-09-27: the whole yellow index (2,771 rows), every guide's immediate precautionary distance, the placard table, and the 41 Table 1 rows on printed pages 290 and 291. Hazard classes come from the Hazardous Materials Table, 49 CFR 172.101. The guidebook may be reproduced without further permission; no government name or seal is used as an endorsement. ### How do I know a number is right? Every row keeps its printed page, and a test compares the yellow index with the blue index row for row, the Table 1 rows with the book's own text layer, and each guide's distance with its printed line. If you find a number that disagrees with the printed guidebook, the printed book wins; please tell us and it gets fixed. ### Can I use this during a real incident? No. It is a training aid. In a real incident follow the current printed guidebook and your employer's emergency plan. ### What is in the drill set? 68 materials across every class except explosives, plus 8 placard only scenarios (the explosives divisions, radioactive and DANGEROUS) that are worked from the placard table. Every highlighted material in the drill set has its Table 1 row on the page, so the distance is always there to read. ### Why does the drill show the table instead of making me remember it? Because the skill is the lookup, not memory. Awareness training asks you to find the right page and read the right column fast and without mistakes, which is what the drill grades. ### Is my data uploaded? No. Any name you type, for a certificate or a class, stays in this browser. Nothing is uploaded. Progress lives in this browser; export it as a JSON or CSV file to keep a copy. ### Can an instructor use it with a class? Yes. Projection mode puts one scenario on the classroom screen with four questions, reveals the answers on the instructor's cue, and prints an answer key with a class name. ### Is it a qualification? Placardset is a training aid; in a real incident follow the current printed guidebook and your employer's plan. The certificate of practice records practice, not training required by any regulation. ### Who runs Placardset? An independent site. Placardset is not affiliated with, endorsed by or produced by any government, transport agency, regulator, fire service or training body.