Driver's License Test Prep
California Practice Vehicle Equipment

At night, while using your high beams, you catch up to a slower vehicle and follow it. What headlight adjustment does California require?

  1. A.
    Dim your high beams only when the driver ahead flashes their brake lights.
  2. B.
    Dim your high-beam headlights to low beams within 300 feet of the vehicle you are following. Correct
  3. C.
    Dim your high beams only when driving on lit city streets.
The Why

The answer is "Dim your high-beam headlights to low beams within 300 feet of the vehicle you are following."

California requires you to dim your high-beam headlights to low beams within 300 feet of a vehicle you are following. If you wait for a courtesy flash from the driver ahead, as choice A suggests, you are following a driver-to-driver custom rather than California's printed distance rule.

Why the others miss

The traps in the wrong answers

A. Dim your high beams only when the driver ahead flashes their brake lights.

The 300-foot rule is tied to a measured distance, not to any signal from the driver ahead. Substitutes waiting for a courtesy flash from the car ahead for California's measured 300-foot trigger.

C. Dim your high beams only when driving on lit city streets.

The 300-foot rule applies on any road at night, not only on lit city streets. Narrows a statewide following rule to lit city streets, where high-beam glare on nearby drivers feels most obviously rude.

The Rule

This question tests your knowledge of Vehicle Equipment in California. Source: California Driver Manual, "Using Your Headlights," p.11..

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