[jonwinstanley]

Sure, you may multiple times but they don't just get built once either. There is non-stop maintenance for a road system.

[iso1631]

There's maintenence in local roads too. And maintence is broadly relative to the damage caused, which is relative to the 4th power of axel weight. A 30 ton truck will cause thousands of times the damage of a 2 ton car, but doesn't pay thousands of times the price.