CDL - Commercial Driver's License Hazmat Practice Test 1 — Questions and Answers
Question 1: When a hazardous materials placard is required, where must it be displayed on the vehicle?
- Only on the rear of the vehicle
- On the front, rear, and both sides of the vehicle (Correct answer)
- On the driver's door and rear only
- Only on the side facing traffic
Correct answer: On the front, rear, and both sides of the vehicle
Federal regulations require hazmat placards to be displayed on all four sides of the vehicle — front, rear, and both sides — so emergency responders can identify the hazard from any direction.
Question 2: Which of the following materials is ALWAYS forbidden from being loaded in the same vehicle as explosives (Class 1)?
- Compressed gases in cylinders
- Detonators and other initiating explosives (Correct answer)
- Corrosive liquids in closed containers
- Flammable solids in limited quantities
Correct answer: Detonators and other initiating explosives
Detonators and initiating explosives must never be transported with other explosive materials because they can trigger a chain reaction detonation, making the combination extremely dangerous.
Question 3: A driver must stop and check for hazmat leaks at which of the following intervals during transport?
- Every 500 miles or at every state line
- Every 150 miles or every 3 hours, whichever comes first (Correct answer)
- At the beginning of the trip only
- Every 25 miles or 30 minutes, whichever comes first
Correct answer: Every 150 miles or every 3 hours, whichever comes first
Regulations require drivers to inspect hazmat loads within the first 25 miles of a trip and then every 150 miles or every 3 hours, whichever comes first, to catch leaks or shifts before they become emergencies.
Question 4: What is the purpose of the Emergency Response Guidebook (ERG) carried by hazmat drivers?
- To record the driver's inspection checklist for each load
- To provide first responders with guidance on handling hazmat incidents (Correct answer)
- To document the shipper's certification of the hazmat load
- To list approved routes for transporting hazardous materials
Correct answer: To provide first responders with guidance on handling hazmat incidents
The ERG is published for use by fire fighters, police, and emergency services to quickly identify hazardous materials and protect themselves and the public during the initial response to a spill or accident.
Question 5: When must a hazmat driver obtain a routing permit from state or local authorities?
- Whenever the vehicle weighs more than 26,001 lbs
- When transporting certain high-hazard materials such as radioactive or explosive cargo that require special routing (Correct answer)
- Any time the driver crosses more than two state lines
- Only when hauling liquid hazardous materials in a tank vehicle
Correct answer: When transporting certain high-hazard materials such as radioactive or explosive cargo that require special routing
Some high-hazard materials — such as certain radioactive materials and high-level explosives — require special routing permits because states and localities have authority to designate specific approved routes to protect populated areas.
Question 6: If a hazardous materials package is leaking when you arrive to pick it up, you should:
- Accept the shipment but note the leak on the shipping paper
- Refuse the shipment and notify the appropriate authorities (Correct answer)
- Wrap the package in plastic and proceed to deliver it
- Continue loading and report the leak upon arrival at the destination
Correct answer: Refuse the shipment and notify the appropriate authorities
A driver must never accept or transport a leaking hazmat package. The correct action is to refuse the load and notify the shipper, your carrier, and if required, the appropriate emergency or regulatory authority.
CDL - Commercial Driver's License Hazmat Practice Test 1
When a hazardous materials placard is required, where must it be displayed on the vehicle?