Recently in Wisconsin truckers were blammed for the rapid detioration of the Zoo Interchange. Nevermind the fact that Mayor Barrett and Governor Doyle have stonewalled any construction and have barred contractors from putting in bids. Nor do they want an expansion to a 4 lane freeway, instead they want trolleys, lightrail, highspeed rail, and more busses.
Three factors at work here. One is the weight per tire. Another is the frequency of weight per given area and the Third is the resistance of the road to weight.
This only addresses #1. Number 2 needs to be addressed by improving (reducing) the traffic density. This can be done by increasing the number of lanes, making use of road to rail options, restricting the hours of use by tractor trailers, etc.
Third option is to improve the specifications for how we build roadways. This would increase the cost of building roads but make them more resistant to loads.