When approaching another vehicle from the rear at night, within how many feet must you dim your bright head...

Question

When approaching another vehicle from the rear at night, within how many feet must you dim your bright headlights?

Thanks

Answer 1

the second you see them turn your highbeems off. I can not stress how irrated I get with drivers behind me with their highbeams blarring into my rear

Answer 2

I agree with iChris but the book says 500 feet.