(If this appears correctly) it should be ÂµA but it's quicker to type uA. Answer: UA stands for Urine Analysis.. When you pee in a cup and the doctors take it and analyze it to see if you or whoever has done any drugs or drank any alcohol in the past two weeks. Microamperes. The u is the closest letter many computer keyboards have to the Greek mu symbol.
Do not blind other drivers with your high beam headlights. Dim your lights by switching to low beams before you are 500 feet from a vehicle coming toward you. If you are following another vehicle, change to low beams when you get closer than 300 feet. Use your high beams whenever possible as long as it is not illegal (i.e., in open country when other cars are not near or on dark city streets when no other traffic would be affected by your high beams).
High-beams are to be turned off when another vehicle is in front of you or approaching on the opposite side of the road. Most of the states require that you switch to low-beams 500 ft. or more from oncoming vehicles. Consult your state's Drivers Handbook for details. The switch for headlights varies between vehicles. Consult your car's owner manual to make sure you know exactly how to turn your headlights on. Each vehicle must also have taillights and brake lights. Most of the states require that the taillights be visible from 500 ft.