It's hard to compare current day toll roads to what would exist in a free market. Today's toll roads are more like monopoly toll roads. You can't just open a road like you can a grocery store, even if you have the money to buy the land. There's lots of permitting, taxpayer subsidies, bribing, etc that needs to be done. It's almost impossible.
In Texas there are double-decker freeways. I have never seen that anywhere else. Traffic in Los Angeles is busy all day long, even Sunday night. There's no incentive to expand the roads or build a second deck.
Incentive should be the votes.
If someone would move his ass and run proper campaign etc maybe it would work.
Something like social responsibility. But I think its different culture, different expectations here.
If I would get pissed on something not done I would go, walk home to home for one day and gather signatures and then lobby politicians. But imo this is possible only in either swing states or patriotic ones.