High beam headlights are most effective for speeds faster than:
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25 MPH.
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50 MPH.
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90 MPH.
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70 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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