Headlights must be used:

From sunset to sunrise.
Only when the road is poorly lit.
Between 7 p.m. and 6 a.m.
Between 6 p.m. and 7 a.m.
Explanation

Colorado law mandates headlight use from sunset to sunrise and during periods of reduced visibility caused by weather or other adverse conditions. Driving during dawn and dusk can be dangerous due to rapidly changing light conditions. Headlights significantly improve vehicle visibility during these transitional periods, helping drivers both see the road and be seen by others. Motorists must activate their headlights whenever visibility drops below 1,000 feet, as defined by state law.

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