near my house is an intersection at which locals practice a particular courtesy.
brown's trace (going either direction) comes down a hill to where it meets lee river road.
if you're heading north on brown's trace you have right of way, whether you are going straight or turning left onto lee river road. if you are turning right onto brown's trace you have right of way. if you're going south on brown's trace, you have a stop sign.
so local people heading north on brown's trace tend to put on the right directional to indicate to drivers waiting at the stop sign that we intend to go straight and not use our awesome left-turning right-of-way power.
it's a small courtesy, but it's how it's done out here.