It depends on the conditions
4
60 meters
20
according to Florida handsbook, you must dim your bright headlights within 300 feet of the vehicle ahead.
Same as during the day. It doesn't change from the day just because its dark out.
around 200 feet :)
10/15
one
4
100 ft ahead
High beam headlights can illuminate anywhere from 30 meters to 150 meters ahead of the car. This is 98 feet to 492 feet away.
12-15 seconds.