I don’t think most of the wear and tear on roads actually comes from the weight of vehicles driving on it, though.

In most places where I’ve lived, the cracks and potholes are caused by the shifting of the ground underneath, freeze/thaw cycles of water/precipitation, and things like that. Most roads would still require maintenance to keep them driveable, even without vehicles driving over them.

It becomes obvious with dedicated bike trails or protected bike lanes, where motor vehicles simply do not have access to those stretches of pavement, where potholes can still form over time.