Sure, but in the sense that road signs or traffic lights are a wear item. They wouldn't be exposed to the real causes of damage to roads (at least in my area) -

Sure, but in the sense that road signs or traffic lights are a wear item. They wouldn't be exposed to the real causes of damage to roads (at least in my area) - transport trucks and road plows. They would need to be replaced at 5-30 year intervals, rather than 4-12 month intervals.