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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteHazmat placards on trucks identify the general type of danger posed by hazardous cargo—not necessarily the exact substance. Read the placard’s color, symbol, wording, and hazard-class number together. A four-digit ID number or proper shipping name, when displayed, can provide more specific identification.
What a hazmat placard tells you
A placard is a diamond-shaped warning displayed on a vehicle carrying certain hazardous materials. Its color, symbol, wording, and number designate a hazard class or division: the broad category of danger associated with the material. The U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA) describes placards as part of an international hazard-communication system intended to help identify the general type of hazard.
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That broad category is not the same as the cargo’s exact identity. A placard can tell you what kind of hazard to expect without naming the chemical or product inside the truck.
How to read the markings
- Read the complete diamond. Consider its color, symbol, wording, and class or division number together. Color alone is not a reliable way to identify a particular substance.
- Look for a four-digit ID number. Depending on the shipment, it may appear on the placard itself or on a nearby orange panel or white square sign. That number helps identify the material more specifically.
- Check for a proper shipping name. When available, the proper shipping name can also help identify the specific material.
PHMSA’s community guidance on identifying hazardous materials explains the general role of placards and other identifying markings.
#1 Best Overall
- Includes (1) Aluminum flip placard with galvanized steel back plate and 8 legends. 8 legends: Dangerous, Class 3 Flammable Liquid, Class 8 Corrosive, Division 2.1 Flammable Gas, Division 6.1 Inhalation Hazard, Division 5.1 Oxidizer, Division 6.1 Poison, Division 2.2 Non-Flammable Gas, as well as a blank file.
- Hazmat flip placard meets DOT placarding specifications of 49 CFR § 172.519 for hazardous materials identification. Placards comply with ISO 9000 Green Initiative, California Buy Recycled program, and EPA Comprehensive Procurement Guidelines (CPG) program.
- Hazmat placard legends are screen printed with fade-resistant UV inks. Stainless steel reinforced quick-release clamps hold panels securely in place. J. J. Keller Dura-Clip fasteners stop clip arms from being dislodged. Clipped corners on top and bottom to accommodate roll-up door applications.
- Back plate is made of .016" galvanized steel (30% post-consumer recycled content). Legends are made of .024" aluminum (75% post-consumer recycled content).
- Measures: Side to side (flanges) – 13.75" (350mm). Left to right (corners) – 18.56" (472mm). Top to bottom (corners) – 14.96" (380mm).
Why some trucks have placards and others may not
Placarding requirements depend on the material, how it is packaged, and other shipment circumstances. It is not accurate to assume that every truck carrying hazardous material must display the same placard—or that every hazardous-material load must display a placard in every situation.
PHMSA’s DOT Chart 17 describes an exception for certain non-bulk materials in Table 2 when the amount is under 454 kilograms. That is not a universal exemption: a bulk package can create a placarding requirement even when the non-bulk threshold would otherwise be relevant. The chart directs readers to 49 CFR Part 172 for the complete rules, and a specific load’s obligations depend on its facts and the applicable regulation.
Rank #2
- Includes 8 placard panels in a single frame: Dangerous Flammable Gas 2 Poison 6 Corrosive 8 Flammable Liquid 3 Oxidizer 5.1 Radioactive 7 Non-Flammable Gas 2 Blank Placards
- Placards meet DOT specifications for transporting hazardous materials
- Changing DOT placards when your load changes is as easy as the flip of a panel
- Spacemaster frames are constructed of corrosion-resistant, fully formed rigid aluminum that provides superior durability
- Panels lock in place with 4 double-riveted stainless steel pressure fasteners
When placards are required under the cited rule, PHMSA says they are generally placed on each side and each end of the transport vehicle, subject to visibility requirements and an exception for coupled vehicles. Placard combinations and substitutions also depend on the load. For example, PHMSA interpretations describe circumstances in which a DANGEROUS placard may substitute for certain POISON and CORROSIVE placards on specified mixed loads; that example should not be treated as a rule for every shipment. See PHMSA Interpretation #09-0055, #02-0043, and #07-0171.
What to do if you see a hazmat incident
A placard is a warning, not an instruction for the public to approach or investigate. If a truck is leaking, damaged, burning, or involved in a crash, stay well clear and contact emergency services. Do not try to identify the material by moving closer to read a number.
Rank #3
- Includes (1) Aluminum flip placard with unpainted back plate and 15 legends. 15 legends: Dangerous, Class 3 Flammable Liquid, Class 8 Corrosive, Division 2.1 Flammable Gas, Division 5.2 Organic Peroxide, Class 3 Combustible Liquid, Division 4.1 Flammable Solid, Division 2.3 Inhalation Hazard, Division 6.1 Inhalation Hazard, Division 2.2 Non-Flammable Gas, Class 9 Miscellaneous, Class 7 Radioactive, Division 6.1 Poison, Division 5.1 Oxidizer, Division 4.2 Dangerous When Wet, and as a blank file.
- Hazmat flip placard meets DOT placarding specifications of 49 CFR § 172.519 for hazardous materials identification. Placards comply with ISO 9000 Green Initiative, California Buy Recycled program, and EPA Comprehensive Procurement Guidelines (CPG) program.
- Hazmat placard legends are a fade-resistant acrylic paint. Stainless steel spring clips hold hazardous materials placards securely in place. Rounded corners for easy handling.
- Aluminum back plate is made of heavy .032" aluminum. Provides wind protection. Aluminum contains 75% post-consumer recycled content.
- Measures: Side to side (flanges) – 13.75" (350mm). Left to right (corners) – 18.56" (472mm). Top to bottom (corners) – 18.56" (472mm).
For responders, PHMSA’s 2024 Emergency Response Guidebook (ERG) provides initial guidance for transportation incidents. When the ID number or proper shipping name is unavailable, responders can use the placard table to select an initial guide. For example, it directs users to Guide 127 for a FLAMMABLE (Class 3) placard, Guide 153 for a CORROSIVE (Class 8) placard, and Guide 111 for DANGEROUS or unknown-material situations. If placards point to different guides, the ERG advises starting with the most conservative guide; responders should use a more specific guide once the material is identified.
The ERG’s incident guidance tells responders to approach from upwind, uphill, or upstream at a safe distance. This is responder guidance, not a reason for bystanders to approach. PHMSA describes the 2024 ERG as a resource for first responders during the initial phase of a transportation incident; PHMSA’s ERG page says members of the public may purchase it.
Quick Recap
Best Value
- Smooth Slide-In Design – Proprietary side rails and thumb notches provide fast, reliable slide‑in and slide‑out placement for hazmat placards.
- Improved Ramp Function – Enhanced ramp profile helps placards glide smoothly over the retaining clip without bending, catching, or snagging.
- Moisture-Resistant Performance – Integrated drain hole channels out water and debris, while raised bumper ribs prevent moisture-related suctioning in wet or freezing conditions.
- Durable Full-Frame Build – Unpainted aluminum construction with a stainless‑steel snap fastener securely holds up to four placards and fits 17.65" W x 17.65" H full‑frame installation dimensions.
- Easy, Accurate Installation – Embossed UP arrow and pre‑drilled mounting holes ensure proper orientation and quick, compatible attachment to van trailers, tanker trailers, box trucks, chemical storage tanks for hazmat hauling.
Rank #4
- Includes 1 Aluminum flip placard with galvanized steel back plate and 8 legends. 8 legends: Dangerous, Class 3 Flammable Liquid, Class 8 Corrosive, Division 2.1 Flammable Gas, Division 1.4 Explosives, Division 2.2 Non-Flammable Gas, Division 6.1 Poison, Class 7 Radioactive, Division 6.1 Inhalation Hazard, Division 5.1 Oxidizer, as well as a blank file.
- Hazmat flip placard meets DOT placarding specifications of 49 CFR § 172.519 for hazardous materials identification. Placards comply with ISO 9000 Green Initiative, California Buy Recycled program, and EPA Comprehensive Procurement Guidelines (CPG) program.
- Hazmat placard legends are screen printed with fade-resistant UV inks. Stainless steel reinforced quick-release clamps hold panels securely in place. J. J. Keller Dura-Clip fasteners stop clip arms from being dislodged. Clipped corners on top and bottom to accommodate roll-up door applications.
- Back plate is made of .016" galvanized steel (30% post-consumer recycled content). Legends are made of .024" aluminum (75% post-consumer recycled content).
- Measures: Side to side (flanges) – 13.75" (350mm). Left to right (corners) – 18.56" (472mm). Top to bottom (corners) – 14.96" (380mm).
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