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You need to not use your brights when behind a vehicle unless there is reasonable distance. A few car lengths is not enough. My rule of thumb is, if I can see THEIR headlight pattern on the road in front of them, no brights. High beams are blinding, especially today with the higher brightness bulbs and the reflections in the rear view mirrors. If you are in doubt, TURN THEM OFF.
500 feet
OPI Brights is a brand of nail polish. It can be purchased at Ulta both in store and online. One may also find some on eBay or Amazon. OPI Brights come in many different colors.
You should dim your lights as soon as you see their lights.
1,000 feet
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.
Not--100
when you see there lights you should dim yours
Within 500 feet of incoming traffic.
100 feet
100 feet
100 feet.