California Car / Permit practice question · Road Signs

You approach a white circular sign showing a truck crossed out in red. What does it tell you to do?

Answer choices

• Passing other vehicles is prohibited beyond this sign.
• Trucks are not allowed on this road.— Correct answer
• You may not turn while the traffic signal is red.
• Slower vehicles must stay in the right lane so faster traffic can pass.

Why this is the answer

A red circle with a line through it shows a picture of what you cannot do, and it may include words. When the picture is a truck, the sign means trucks are not allowed on that road. Follow the sign's instruction. It does not restrict passing, turning on red, or slower vehicles, which have their own signs.

Source: California Driver Handbook — Traffic Signs

Content reviewed against official driver handbooks · August 12, 2026