Enable editors to add traffic control devices to intersections like stop signs and traffic lights. This could help drivers navigate when there are few signs/lights.

It’d also be helpful since many drivers make “landmarks” along the way. They’ll know to look for the stop sign in 1000 ft, not just to make a right in 1000 ft.

I don’t think it makes sense to let phone users make these additions, though they can communicate through URs.