With fewer vehicle-miles, maintenance of the road should be reduced. This would not apply in frost areas since those surfaces will degrade on their own.
Ah but the big rigs still need to rumble down the road to restock the local stores. What do you think does more damage to a road, your 4,000 pound car, or a fully loaded 80,000 pound semi??? Most trucks have 12,000 pounds on the front axle, 34,000 on the rear set of truck axles, and 34,000 on the trailer axles.