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at least 2m
In most states it is 500 Feet. Common sense should prevail.
Dim headlights form high beam to low beam
Turn off headlights and leave parking lights on.
Turn off headlights and leave parking lights on
Turn off headlights and leave parking lights on.
turn off headlights and leave parking lights on
approaching an incline
never
Both.
If you can see the area lit by their headlights, then you are probably close enough to dim your own.
Keep your headlights on low beam.