The 2016 Tonasket, Washington, population is 1,016. There are 1,265 people per square mile (population density).
One of these is the Side Marker Light, which indicates a vehicle's presence and its dimensions. But even if you don't drive a truck or a trailer, installing this type of light is a great idea since it makes driving in poor visibility conditions so much safer.
Mile markers count from west to east for highways going in those directions, and they start from the south and count north, for highways going in those directions. There may be different systems designated for state highways. Not all state highway systems have mile markers, but federal interstate highways do have them.