Road Signs

Study questions with answers

4 sample Road Signs questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.

1. 1. A placarded hazardous-materials vehicle must display at least how many placards?

   Correct answer: Four identical placards

   A placarded load must show at least four identical placards, one readable from each of the four directions around the vehicle.

   Source: Illinois CDL Guide — Sec. 2.24, Hazardous Materials

2. 2. At a railroad crossing, what does a sign beneath the crossbuck showing a number indicate?

   Correct answer: The number of tracks at the crossing

   When the road crosses more than one set of tracks, a small sign under the crossbuck states how many tracks there are, so you know to check each one before proceeding.

   Source: Illinois CDL Guide — Sec. 2.15, Railroad Crossings

3. 3. What does a round, black-on-yellow sign placed ahead of a railroad crossing mean?

   Correct answer: A railroad crossing is ahead — prepare to stop

   The round yellow advance warning sign tells you a railroad crossing is ahead. Slow down, look and listen for a train, and be ready to stop at the tracks.

   Source: Illinois CDL Guide — Sec. 2.15, Railroad Crossings

4. 4. What shape and orientation must a hazardous-materials placard have?

   Correct answer: A diamond set on a point

   A placard is set on a point in a diamond shape and must measure no less than 10 3/4 inches on each side, readable from every direction around the vehicle.

   Source: Illinois CDL Guide — Sec. 2.24, Hazardous Materials