Sure, but to be fair infrastructure should be "free" to all citizens (like public schools) or some approximation of fair/usage based.
The cost of road related infrastructure (roads, highways, parking, tunnels, bridges, etc) and the land consumed by that infrastructure is considerable. I can see flat rate being something like the wear and tear you'd expect from a normal/popular vehicle, like say a honda accord or toyota camry. But if people buy something huge (that takes up more space) and is heavier they should pay more for it to support the increased cost of the wear and tear on the infrastructure. That can be substantial, I believe the wear and tear on a road scales with the 4th power of the weight.
The cost of road related infrastructure (roads, highways, parking, tunnels, bridges, etc) and the land consumed by that infrastructure is considerable. I can see flat rate being something like the wear and tear you'd expect from a normal/popular vehicle, like say a honda accord or toyota camry. But if people buy something huge (that takes up more space) and is heavier they should pay more for it to support the increased cost of the wear and tear on the infrastructure. That can be substantial, I believe the wear and tear on a road scales with the 4th power of the weight.