Flash your high beams once or twice quickly
At night yes, but in the day no because the sunlight overpowers the headlights and high beam lights.
Car headlights have to be able to "dip" so as not to dazzle oncoming traffic, they therefore can switch between a "high" beam and a "dipped" beam and thus have a dual beam.
500
Perhaps he is in a large vehicle and his lights are already on low. All you can do is decrease speed and try to stay on the road. More flashing and he may show you his high beams!
500 feet
Dim headlights form high beam to low beam
True
I believe that is true, I haven't had a Fl D L since 1982-1983.
Almost never the same except for a few instances. Normally low beam are 55 watt and high beam are 65 watt. See sources and related links below to lookup your vehicle.
Within 500 feet of an oncoming car. Within 350 feet of a car you are traveling behind.
Use your high-beam headlights at night whenever it is legal and safe.
High beam headlights reveal objects at a distance of at least 450 feet away. High beam headlights allow the driver to view obstacles in the road much sooner than low beam headlights.