I live in Michigan and the roads are repaved what seems like every other year. After each winter, there are potholes the size of craters on the moon. Very dangerous when everyone is swerving into incoming traffic and slamming on breaks to avoid them.

In my limited understanding, the frequency of required maintenance depends heavily on weather conditions, and also on the size of vehicles who commonly travel on the road. Trucks cause orders of magnitude more wear on roads than cars do.

Weather conditions it is, then. It doesn't snow here, though it rains a lot. But if snow is a problem, then a solar road makes much less sense anyway.