In the case of a motorist not having their lights dimmed, such as driving with their high-beams on when not needed, there are a number of ways in which you can deal with the situation.
The first, and i believe most common way, is to flash your high-beams at them. Of course this will only work if the vehicle is ahead of you.
If the vehicle is behind you, i would suggest a lane change, or even reposition your mirrors so the light isn't in your eyes.
Slam on the breaks and make him go round
I hope i helped you! This is all i have!
By the way, i posted this previously :)
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.
It perfectly depends on where you live or drive. You should dim your headlights right when you see another vehicle in front of you or right when you see the lights of another vehicle. It doesn't matter if you are seeing the tail lamp (both of you are traveling in the same direction), you should dim the lights or else it is going to make difficulties for the driver in front.
If you can see the oncoming vehicle then he can see you. Dim your lights at that time.
500'
When you are within 500 feet of an oncoming vehicle or you come up behind a vehicle.
never
You should dim your lights as soon as you see their lights.
If you can see the area lit by their headlights, then you are probably close enough to dim your own.
when you see there lights you should dim yours
If you are a courteous driver, you will dim them when you see their tail lights. No one likes bright lights in their mirrors, reflecting into their eyes.
At night is is hard to judge distance so a better way is to dim your lights as soon as you see the lights of the oncoming vehicle
The lights on your vehicle may be going dim because the bulb is getting ready to blow out. Try changing your bold and see if that helps.