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If you see a truck signaling a lane change, it needs more space — slow down to let it in. They often signal well in advance.
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Don’t cut off trucks — they require more distance to stop. When passing, don’t merge back in front of the truck until you can see the entire front of the truck in your rearview mirror.
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You can flash your headlights to signal a truck that it’s safe to return to the lane after passing — this is common trucker courtesy.
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Trucks often swing wide when turning, especially right turns. If you’re behind a turning truck, never try to dart to its right — you could get squeezed between the truck and curb.
Topic 4 · Section 25
Large Vehicles and Trucks
Check you have it
179 practice questions cover defensive driving and safe driving practices, each explaining the reasoning behind its answer.
Practise this topicSource: California Driver's Handbook (DL 600, rev. 6/2025). Edited by Fernando Aguilera. Aprobify is not affiliated with the California DMV.