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Flash your high beams
500 meters
no
Both.
You can use your high beams when it is dark and no one is approaching you and you aren't following anyone.
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.
I like to switch around 200-300 feet away from them
You should use your low beams to avoid blinding the driver ahead as you lights reflect in his mirrors.
High beams should only be used in extreme darkness and only when there is no other vehicle in your opposing lane. The reason behind this is because high beams can be blinding in the opposing lane and can and have lead to very serious accidents.Answer If your high beams were left of as on-coming traffic was approaching it would be blinding to the other driver. If you have your high beams on while in back of another car, it could also be blinding to the driver your following through side and rear view mirrors. Either way it is dangerous. If your high beams were left on constantly through - lets say a city - where lighting is good, the police officer may have determined that it was suspicious, and was checking to see if you were on alcohol or drugs.
Use low beams.
Because - as you overtake the vehicle in front, high-beams will be reflected straight back at the driver - through their mirrors. Low beams are angled more towards the ground.
1,000 feet.