use low beam lights within 300ft of on coming vehicles
according to Florida handsbook, you must dim your bright headlights within 300 feet of the vehicle ahead.
500 feet if the vehicle is coming to you, 300 feet if you are following it.
at least 2m
500 to 1000 ft.
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.
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.
500 feet is what I was taught but different areas have different rules. You may have to check with the DMV or the PD about this.
Within 500 feet of an oncoming car. Within 350 feet of a car you are traveling behind.
500 feet
500
Within 500 feet of oncoming traffic.
If you can see the oncoming vehicle then he can see you. Dim your lights at that time.