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.
It is so that when someone needs assistance on the side of the road you can tell the people coming to help you which mile marker you are between so that they are not just going on a blind search for someone on the highway. Also to show the total distance from the starting point of the highway.