California Car / Permit practice question · Traffic Laws
Before changing lanes on a freeway, how far in advance should you signal your intention?
Answer choices
- At least five seconds before you change lanes— Correct answer
- Only after you have already moved into the new lane
- One second is enough at freeway speeds
- Signaling is optional if no other cars are visible
Why this is the answer
On a freeway, signal at least five seconds before you change lanes, since traffic moves quickly and others need time to react. One second is too short, and you must signal before every lane change even when no other cars are visible. Signaling only after you have moved over defeats the purpose of warning others.
Source: California Driver Handbook — Signaling
Content reviewed against official driver handbooks · August 12, 2026
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