We don’t have a French-style alternative to the montorway network, though - much as tolls on all motorways might bring in some money, it’ll also shift much of the traffic onto the relatively more expensive other roads. I think the money-saving in transport is being done by simply not spending very much on it, you can’t really both do that and charge for it.
We already have toll roads, like the M6 that you mentioned. None of these are unanswered questions.
Yup, they have been rumbling on about this for ages. Don’t see how this is modelled on the Dart Charge though if we’re paying 75% the fee a car does when dart is free for bikes!
All this is going to do is push traffic elsewhere in my opinion. Meaning things like the Rotherhithe tunnel which is already rammed will become even worse.