Shipping Papers, Markings, Labels, and Placards — Commercial Driving (CDL)

Objective. Students will read a HazMat shipping paper, verify required entries (proper shipping name, hazard class, ID number, packing group, quantity, and emergency contact), and correctly apply labels and placards to a mock vehicle for a given load.

Why Shipping Papers, Labels, and Placards Matter

Hazardous materials (HazMat) regulations exist to protect you, the public, and emergency responders. When a vehicle carrying dangerous goods is involved in an accident, the first thing a firefighter or paramedic reaches for is the shipping paper. If that paper is wrong or missing, responders may not know what they are dealing with and could be seriously injured. Federal law under 49 CFR Part 172 spells out exactly what must appear on shipping papers and how vehicles must be marked. As a CDL driver, you are personally responsible for verifying these documents before you move a load.

The Hazardous Materials Shipping Paper

A shipping paper for HazMat is not the same as a standard bill of lading, but the two are often combined into one document. The HazMat entries must stand out — either listed first on the page, highlighted, or printed in a contrasting color — so they are immediately visible to emergency responders.

Under 49 CFR 172.202, every hazardous material entry must contain five basic description elements in this order:

1. Proper shipping name — the exact name from the Hazardous Materials Table (HMT) in 49 CFR 172.101, not a trade name or nickname.

2. Hazard class or division — for example, Class 3 (Flammable Liquid) or Division 1.4 (Explosives).

3. Identification number — the UN or NA number assigned in the HMT (e.g., UN1203).

4. Packing group — Roman numeral I, II, or III indicating the degree of danger within the class (PG I = greatest danger). Not all classes require a packing group.

5. Total quantity — with a unit of measure (gallons, pounds, liters, etc.).

The description may also include the number and type of packages. The order of elements 1 through 4 may vary slightly if all required information is still clearly present.

Emergency Response Telephone Number

Every shipping paper must include an emergency response telephone number that is monitored at all times (24 hours a day, 7 days a week). The number must connect to someone who knows the hazards of the material and can provide guidance in English. This is often a number for a contracted emergency response information service. An unanswered voicemail does not satisfy the requirement.

Where to Keep Shipping Papers

While driving, shipping papers must be within your reach or in a pouch on the driver's door. When out of the cab, leave them on the driver's seat or in a visible location at the door. This rule ensures responders can find them quickly.

Labels

Labels are diamond-shaped (square-on-point) markings applied directly to individual packages. Each label corresponds to the hazard class or division of the material inside. For example, a package of Class 3 Flammable Liquid gets a red flammable-liquid label. If a material has a primary hazard and one or more subsidiary hazards, all required labels must appear on the package.

Labels must be:

Placed on the same surface of the package, near the proper shipping name marking if possible.
Clearly visible and not obscured by other labels or markings.
The correct class-specific design, color, and symbol as specified in 49 CFR 172.411–172.450.

Placards

Placards are larger diamond-shaped signs displayed on the outside of the vehicle. They communicate the hazard to everyone on the road and to first responders before they ever approach the vehicle. Placards must be displayed on all four sides of any vehicle (front, rear, left side, right side) when required.

When Are Placards Required?

The quantity threshold rules are important:

Table 1 materials (most toxic, infectious, explosive, radioactive, and pyrophoric materials): placards are required in any quantity.
Table 2 materials (most other HazMat classes): placards are required when the total weight of all HazMat aboard reaches 1,001 pounds (454 kg) or more.

When a vehicle carries two or more classes of Table 2 materials in amounts that each fall below 1,001 lb individually but together reach or exceed that threshold, a DANGEROUS placard may be used instead of separate class placards — unless 1,001 lb or more of any single class is present, in which case the specific class placard for that material is required.

Placard Orientation and Placement

Placards must be:

Readable from left to right and right side up.
Displayed on a square-on-point (diamond) orientation.
Visible from the direction the placard faces.
Mounted at least 3 inches away from any other markings so they are not obscured.

Subsidiary Hazard Placards

Some materials have more than one hazard. When required, subsidiary hazard placards must also be displayed. The subsidiary placard does not replace the primary hazard placard — both are displayed.

Safety Points for HazMat Drivers

Verify before you drive. Check the shipping paper against the load and against the placards on the vehicle before moving. A missing or wrong placard is a federal violation and a safety hazard.
Never alter or white-out shipping paper entries. If an error exists, the shipper must provide a corrected document.
Keep the Emergency Response Guide (ERG) accessible. The ERG helps you and first responders respond to spills or releases.
If in doubt, do not move the load. Contact your dispatcher and the shipper to resolve any discrepancy.
Placard removal. Remove or cover placards as soon as the vehicle is no longer carrying that HazMat and any residue has been removed or is below threshold. Displaying a placard for a material not aboard is also a violation.

Key terms10

Proper Shipping NameThe exact name for a hazardous material as listed in the 49 CFR 172.101 Hazardous Materials Table; trade names or nicknames are not acceptable substitutes.

Hazard Class/DivisionA number (and sometimes a subdivision letter) assigned to a material based on its primary type of danger, such as Class 3 for flammable liquids or Division 2.1 for flammable gases.

Identification Number (ID Number)A four-digit UN or NA number assigned to each hazardous material in the HMT (e.g., UN1993) that appears on shipping papers, packages, and certain placards to identify the material.

Packing Group (PG)A Roman numeral (I, II, or III) indicating the degree of danger within a hazard class; PG I is the greatest danger, PG III is the least. Not all hazard classes use packing groups.

LabelA small, diamond-shaped hazard warning affixed directly to a package; its color and symbol identify the hazard class of the material inside.

PlacardA large diamond-shaped sign displayed on all four sides of a vehicle transporting hazardous materials; it communicates the hazard class to road users and emergency responders.

DANGEROUS PlacardA general placard that may be used when a vehicle carries two or more Table 2 HazMat classes totaling 1,001 lb or more, but no single class reaches that threshold individually.

Emergency Response Telephone NumberA 24/7 monitored phone number that must appear on every HazMat shipping paper; it connects callers to knowledgeable personnel who can provide guidance during an incident.

Subsidiary HazardA secondary danger of a material beyond its primary hazard class; subsidiary hazard labels and, when required, placards must be displayed in addition to those for the primary hazard.

Hazardous Materials Table (HMT)The master reference table in 49 CFR 172.101 listing proper shipping names, hazard classes, ID numbers, packing groups, labels required, and placard references for regulated materials.

In class: Instructor demonstrates how to read a bill of lading and hazardous materials shipping paper side by side, pointing out the five required basic description elements under 49 CFR 172.202 and the required emergency response telephone number; students practice with three sample shipping papers of increasing complexity, flagging any missing or incorrect entries. · Label and placard identification station: students rotate through six table stations, each containing a material sample card (name, class, quantity), a bin of assorted label and placard laminate cards, and a checklist; they select correct labels and placards and record their choices on the checklist for instructor verification. · Mock-vehicle placard drill using a full-size trailer mockup or four placard-frame boards positioned to represent front, rear, and both sides of a vehicle; students receive a load scenario sheet, choose correct placards from a placard kit, and mount them in the correct orientation within 10 minutes.
Materials: Sample HazMat shipping papers (instructor-created, multiple commodity types), bill of lading forms, 49 CFR 172.101 Hazardous Materials Table (printed), DOT label and placard laminate kit, four placard frame boards or trailer mockup, placard kit (full set of standard placards), student checklists
Check: Instructor observes placard drill; student must select the correct placard(s), mount all four sides with correct orientation, and identify any required subsidiary hazard placards with zero critical errors (wrong placard or missing required placard = fail); shipping paper review scored on a 10-point rubric with pass at 8 of 10.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.