How many sides of a tractor-trailer require placards when transporting hazardous materials?
Answer: C
The left and right sides, plus the front and rear of the vehicle
Placards are required on all four sides of the vehicle to communicate the risk from all directions.
All choices
- AThe left and right sides of the vehicle
- BThe front and rear of the vehicle
- CThe left and right sides, plus the front and rear of the vehicle
Why the other answers are wrong
A. The left and right sides of the vehicle
Choice A is wrong because placards are required on all four sides, not just the left and right sides.
B. The front and rear of the vehicle
Choice B is wrong because placards must be on the sides as well as front and rear, not only front and rear.
CDL HAZMAT Test Info
Questions on Exam
30
Passing Score
80%
Time Limit
Typically 30 minutes; varies by testing location
The HAZMAT test content is federally standardized, so this question applies in every state. Age limits, fees, and testing procedures do vary — check your state's CDL requirements.
Ready to pass your CDL HAZMAT exam?
Get full practice exams, study mode, and simulated tests with detailed explanations.
Risk-free — cancel anytime, no charge until trial ends.
More CDL HAZMAT Practice Questions
- Which of the 9 hazard classes may NOT be transported in a temperature-controlled trailer?
- Your vehicle contains explosives, oxidizer, or flammables. No one may smoke within ____ feet of the vehicle.
- It is recommended that a driver refrain from smoking or using an open flame within 25 feet of:
- A vehicle placarded for hazardous materials must have placards on ____ sides.
- What is the purpose of placards?