Commercial Driver's License (CDL) Cargo Handling and Hazardous Materials Syllabus

Why might a tank loaded with a dense liquid be only partially filled?

Because some liquids are so heavy that filling the tank completely would exceed legal weight limits, so the tank is only partly loaded.

Why do tankers have a high center of gravity and what is the driving consequence?

Liquid loads sit high in the tank, raising the center of gravity; this makes tankers very prone to rollover, so drivers must slow down well before curves.

How should a tanker driver handle curves and ramps?

Slow down before entering the curve, then accelerate gently through it; posted speed limits for curves and ramps may be too fast for a tanker.

What braking technique helps control liquid surge in a tanker?

Brake smoothly and early, increase following distance, and avoid sudden stops or quick steering, because surge can push the truck forward even after the brakes are applied.

What special tank components must be inspected before driving a tanker?

Check the tank body/shell for dents and leaks, intake/discharge/cutoff valves, pipes and connections, manhole covers and vapor recovery, and the emergency shut-off systems.

What endorsement is required to haul liquids or gases in a bulk tank with a capacity of 1,000 gallons or more?

The Tank Vehicle (N) endorsement.

How many hazardous materials hazard classes are there, and name a few?

There are 9 hazard classes: 1-Explosives, 2-Gases, 3-Flammable Liquids, 4-Flammable Solids, 5-Oxidizers, 6-Poisons/Toxic, 7-Radioactive, 8-Corrosives, 9-Miscellaneous.

What is a 'division' within a hazard class?

A division is a subcategory of a hazard class that further describes the nature of the hazard (e.g., Class 1 explosives have divisions 1.1 through 1.6).

What hazard class includes flammable liquids, and give an example?

Class 3 (Flammable and Combustible Liquids); examples include gasoline, fuel oil, and alcohol.

What hazard class number identifies corrosive materials?

Class 8 (Corrosives), such as battery acid and sodium hydroxide.

What are shipping papers and what must they describe?

Shipping papers describe the hazardous materials being transported, listing the proper shipping name, hazard class, identification (UN/NA) number, packing group, and quantity.

Where must hazardous materials shipping papers be kept in the cab?

Within the driver's reach while restrained by the seat belt (in a pouch on the driver's door or seat) and clearly visible/recognizable to emergency responders if the driver is incapacitated.

What is the Hazardous Materials Table and what key columns does it list?

A regulatory table listing each material's proper shipping name, hazard class/division, identification number, packing group, label codes, and special provisions used to prepare shipping papers and select placards.

What does the 'X' or 'RQ' in the HM column of a shipping paper indicate?

An 'X' (or 'RQ') in the HM column identifies the entry as a hazardous material (and RQ marks a reportable quantity) subject to the hazmat regulations.

What is a placard and what is its purpose?

A placard is a diamond-shaped sign placed on the outside of a vehicle to warn others of the hazard class of the materials being transported.

On how many sides of a vehicle must placards be displayed, and at what minimum size?

On all 4 sides (front, rear, both sides); placards must be at least 10.75 inches square, turned upright on a point (diamond shape).

When are placards required for a hazardous materials shipment?

Table 1 materials require placards in any amount; Table 2 materials require placards when the total amount of all hazmat is 1,001 lb or more.

What is the difference between marking and placarding?

Marking is putting the required identification (proper shipping name and ID number) on the package or vehicle; placarding is displaying the diamond hazard-class signs on the vehicle exterior.

What does the HazMat regulations system aim to accomplish (its three purposes)?

To contain the product, communicate the risk, and ensure the safe transportation of hazardous materials through trained drivers and proper handling.

What is required for HazMat security awareness training?

Drivers must receive training on security risks of hazmat transport, methods to enhance security, and how to recognize and respond to possible security threats.

What is a key loading and unloading safety rule for hazardous materials?

Turn off the engine (except for pumps), set the parking brake, use chocks, avoid open flames/smoking near flammables, and never load damaged packages or incompatible materials together.

What does it mean that some hazardous materials cannot be loaded together?

The Segregation and Separation Table prohibits loading certain incompatible materials together because they could react dangerously (e.g., oxidizers with flammables).

What routing restriction applies to placarded HazMat vehicles?

Drivers must follow designated/preferred HazMat routes, avoid tunnels, populated areas, and heavily traveled roads where prohibited, and obey state and local route restrictions.

What are the attendance rules for a placarded vehicle carrying hazardous materials?

The vehicle must be attended at all times by its driver or a qualified person, except while in a safe-haven; the attendant must be within 100 feet and have an unobstructed view of the vehicle.

What are the parking restrictions for Division 1.1, 1.2, or 1.3 (explosive) loads?

Never park within 5 feet of the traveled roadway, and not within 300 feet of an open fire, bridge, tunnel, building, or place where people gather, except for brief operational needs.

What is the Emergency Response Guidebook (ERG)?

A DOT guidebook that helps first responders quickly identify hazards of materials involved in an incident and protect themselves and the public during the initial response phase.

How do you find a material's guide page in the Emergency Response Guidebook?

Look up the material by its 4-digit ID number (yellow-bordered section) or by proper shipping name (blue-bordered section), which directs you to an orange-bordered guide page of response actions.

What should a driver do first at the scene of a hazardous materials incident?

Keep people away, stay upwind/uphill, avoid contact with the material, identify the material using shipping papers and the ERG, and notify emergency services and the carrier.

When must a hazardous materials spill or leak be reported, and to whom?

Immediately report incidents involving death, injury requiring hospitalization, property damage over $50,000, evacuation, or a reportable quantity release to the National Response Center and the carrier.

What is the National Response Center's role in HazMat incidents?

It is the federal point of contact (1-800-424-8802) for reporting hazardous materials and oil spills so a coordinated emergency response can be initiated.

What information must be reported after a HazMat accident or spill?

The reporter's name, carrier name, location and time of the incident, the hazardous material involved (name and ID number), quantity released, and the extent of injuries or damage.

What endorsement and background check are required to transport placardable quantities of hazardous materials?

The Hazardous Materials (H) endorsement, which requires passing a knowledge test and a TSA security threat assessment (background check).