HazMat Placarding Requirements (49 CFR 172.504)

When placards are required for hazardous materials shipments under 49 CFR §172.504, the difference between Table 1 and Table 2 materials, the 1,001-pound threshold, and the DANGEROUS placard.

6 min read · Updated October 2026

Placards tell emergency responders what's in a vehicle before they get close. The Hazardous Materials Regulations (HMR) in 49 CFR Parts 171–180 govern placarding. The core rule is §172.504.

Table 1 vs. Table 2

Table 1 materials must be placarded in any quantity. They are:

Division 1.1, 1.2, and 1.3 explosives
Division 2.3 poison gas
Division 4.3 dangerous when wet
Division 5.2 organic peroxide, Type B, liquid or solid, temperature controlled
Division 6.1 poison inhalation hazard (PIH) materials
Class 7 radioactive (Radioactive Yellow III label)

Table 2 materials, which is everything else including Class 3 flammable liquids, Class 8 corrosives, and Division 2.1 flammable gas, must be placarded when the total gross weight is 1,001 lbs (454 kg) or more. The exception in §172.504(c) does not apply to bulk packagings or to materials in Table 1.

The DANGEROUS placard

A carrier hauling non-bulk packages with two or more categories of Table 2 materials may display a single DANGEROUS placard instead of separate placards (§172.504(b)). However, any Table 2 material weighing 2,205 lbs (1,000 kg) or more of one category loaded at one facility must have its own specific placard.

Placement and visibility

Placards go on all four sides of the vehicle (§172.504(a)).
Each placard must be clearly visible and readable, at least 3 inches from other markings, and not obscured by ladders, doors, or tarps (§172.516).
Bulk packages may also need UN/NA identification numbers on the placards or on orange panels (§172.332).

Common HazMat violations at roadside

Placards missing, wrong, damaged, or faded.
Shipping papers missing, incomplete, or not within the driver's reach (§177.817).
No emergency response information or 24-hour phone number (§172.602 and §172.604).
Packages not secured against movement (§177.834).
A driver without a HazMat endorsement when one is required.

DotCheck can review a photo of placards or shipping papers and flag likely Part 172 and 177 issues before you leave the dock.

FREQUENTLY ASKED QUESTIONS

How many pounds of hazmat require placards?

Table 2 hazardous materials require placards when the aggregate gross weight is 1,001 pounds (454 kg) or more. Table 1 materials require placards in any quantity.

When can I use a DANGEROUS placard?

A DANGEROUS placard may be used for non-bulk packages containing two or more categories of Table 2 materials, unless 2,205 lbs or more of one category is loaded at a single facility.

Where must hazmat placards be displayed?

Placards must be displayed on each side and each end of the vehicle, clearly visible and readable.

This guide is for general information and pre-inspection preparation only. It is not legal advice. Always check the current text of 49 CFR at ecfr.gov and the current CVSA OOS Criteria.