[gldalmaso]

If usage of the road cost money per time unit, the incentive for whoever is getting that money is that roads become less effective, not more. Wouldn't distance traveled be better? That way ineffective traffic engineering would lead to jams that would mean less money made.

[TomMarius]

My idea is that no one will be getting this money, the road would be owned by an autonomous organisation and maintained automatically, thus completely eliminating the human factor. The same autonomous organisation would optimize routes, and optionally even announce free places in shared vehicles.