Placarding — CDL Hazardous Materials Practice Test

This CDL Hazardous Materials Placarding practice set has 23 practice questions based on the official exam materials, each with an instant explanation. You need 80% on the real CDL Hazardous Materials knowledge test to pass.

Sample questions

Three questions from the Placarding bank with the correct answer and an explanation. The practice quiz above draws 23 questions at random from the same bank.

1. When must you attach the appropriate placards to a vehicle carrying hazardous materials?

   • Before you drive the vehicle — Correct answer
   • Within 24 hours after loading
   • Only when an officer asks to see them
   • At the first rest stop after departure

   Explanation: Attach the correct placards before you drive. You may move an improperly placarded vehicle only during an emergency, to protect life or property. English term: placard（标牌 / cartel） = the diamond-shaped hazard warning sign.

   Handbook: Placarding — Attaching placards

2. On a placarded vehicle, where must the placards appear?

   • On both sides and both ends — Correct answer
   • On the rear only
   • On the front and rear only
   • On the left side only

   Explanation: Placards must appear on both sides and both ends of the vehicle — that is all four sides — so the hazard is visible from every direction. English term: placard（标牌 / cartel）.

   Handbook: Placarding — Placement

3. How must each placard be positioned so it can be read correctly?

   • Easily seen from the direction it faces, words and numbers level and read left to right — Correct answer
   • Tilted at a 45-degree angle to the road
   • Facing only toward oncoming traffic
   • Upside down so it stands out

   Explanation: Each placard must be easily seen from the direction it faces, and placed so the words or numbers are level and read from left to right. English term: placard（标牌 / cartel）.

   Handbook: Placarding — Readability