I have been i situation in the Australian outback where you can be approaching a car for nearly an hour traveling at over 120 kmh and their high beam is already irritating. so I turn mine down when ever I see on coming traffic. and normally they do the same for me. So the right time to turn down your high beam is when you are facing oncoming traffic. any time you are blinded by oncoming traffic just flash your high beams and in the majority of cases the oncoming car will dip his lights.
You should dim your lights as soon as you see their lights.
when you see there lights you should dim yours
at a set of red lights. how many feet should you be behind the vehicle in front of you?
You should dim your headlights within 500 feet of the car in front of you. The rule of thumb is, if you can see another car, dim your lights.
You may not park within ______ of a railroad track.
If you can see his headlights, drop your high beams. In some states its the law 300 feet at least.
500 feet
If you can see the oncoming vehicle then he can see you. Dim your lights at that time.
1,000 feet
Not--100
500ft if it's oncoming. 350ft if you're coming up behind someone.
Here in California, by law it's 500 feet (a football field-and-a-half), but be kind and dim your bright lights well before that.