Or we could just skip the proxies and bill people directly based on the estimated road damage done based on number of miles driven and the type of car driven. W

Or we could just skip the proxies and bill people directly based on the estimated road damage done based on number of miles driven and the type of car driven. We could use the ubiquitous highway cameras to track that. Call it a "road use tax". I guess people might not appreciate the government tracking their movements, though.