4000 feet.
You must dim your high-beams if you're within 500 feet of an approaching car and dim your high-beams within 300 feet of the vehicle you follow.
Normally 500 feet, but think if you wanted someones headlights in your eyes.
Within 500 feet of an oncoming car. Within 350 feet of a car you are traveling behind.
You MUST state what units are the measurements in - millimetres, inches, feet, or what.
In the NFL both feet MUST be in bounds. In high school one foot MUST be in bounds, and flag football I believe one, maybe two.
1 One (NFL requires two).
High beams must illuminate objects at least 500 feet ahead of the vehicle. This ensures that drivers can see far enough down the road to react to potential hazards. Additionally, high beams should not blind oncoming drivers, which is why they should be dimmed when another vehicle approaches within 500 feet.
I think you meant to ask how high a hill must be before it is considered to be a mountain. In the UK the threshold is 2000 feet.
200 feet
500 feet
200 feet