It is not speed that determines when lights need to go on, but how dark it is outside. A good measure is twilight to have lights on. In dim light cars are hard to see and if your car is a color that blends in with the surrounding area it makes it harder for other drivers to see. I have lights on my car come on automatically as driving lights no matter what time of day.
when it is raining or at night. Also generally when it is dark.
Turn off headlights and leave parking lights on.
turn on your headlights
Turn off headlights and leave parking lights on
turn off headlights and leave parking lights on
Turn off headlights and leave parking lights on.
turn off headlights and leave parking lights on
Well it depends if you're having the old cars it is probably going to go down in speed when you turn the headlights on. If you have models 3 years or less it wouldn't slow down.
check your dimmer switch;set to automatic which should have starlike design.
Wipers
You should flick the headlight switch after you turn the car on.
Yes! Pilots are very careful about their night vision, and you -will- upset them if you put your headlights in their eyes. This is not to say that you should turn all your lights off though. You should have your parking lights on, as well as turning on your four-way blinkers (hazard lights) whenever driving on the airport ramp.