The government here in the UK have proposed something similar. They want to turn existing, free, Motorways into toll roads, they claim to reduce congestion. Of course it won't; it will simply push traffic on to other, less suitable roads and produce even more congestion.

The government say they will reduce petrol and/or car tax in compensation for the tolls. No one believes them (surprise, surprise) so the vast majority of people are against the proposal.