California Permit Test Coach
Safe drivingQuestion 148 of 229

When must you use your horn on a narrow mountain road?

  1. When you cannot see 100 feet ahead
  2. At every curve, day or night
  3. When you cannot see 200 feet ahead
  4. When another car is behind you
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Correct answer: When you cannot see 200 feet ahead

Use the horn to warn oncoming traffic where you cannot see at least 200 feet ahead.

Source: California Driver's Handbook (DL 600, California DMV, 2025), Section 5. An Introduction to Driving: Using Your Horn, page 11

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Questions last reviewed: 18 October 2026