Sharing the roadQuestion 137 of 229

A truck shows a diamond-shaped placard. What must it do before it crosses railroad tracks?

  1. Stop
  2. Slow to 25 mph
  3. Honk its horn
  4. Turn on its flashers only
Show answer

Correct answer: Stop

The diamond means the load may be dangerous, such as gas or explosives. These trucks must stop at railroad tracks.

Source: California Driver's Handbook (DL 600, California DMV, 2025), Section 7. Laws and Rules of the Road: Vehicles with Hazardous Loads, page 50

Practice sharing the road

Questions last reviewed: 18 October 2026