High beam headlights are most effective for speeds faster than:
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50 MPH.
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90 MPH.
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70 MPH.
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25 MPH.
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Explanation
High beam headlights can illuminate up to 450 feet of the road ahead and are most effective at speeds over 25 MPH. Low beams are best for speeds up to 20–25 MPH, and drivers should avoid 'overdriving' these lights (driving too fast for what they can see).
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Other questions in the same category: Proper Use of Windshield Wipers and Headlights
If an approaching driver refuses to switch their high beams to low, you should:If a car approaches you with bright headlights, you must _________________ to prevent being temporarily blinded.When it starts raining enough to turn on your windshield wipers, you should:By law, headlights must be turned on:High beam headlights should be used at night:What is NOT true regarding the use of headlights?On rainy, snowy or foggy days, you should turn on your windshield wipers and:Your headlights must be on low beam when you are within _______ of an oncoming vehicle.When meeting a car with blinding headlights, you should:Bright lights must be dimmed _____ feet before meeting an oncoming vehicle.
This question appears in the following DMV practice tests: