About five years ago I saw a statistic which showed that only approximately 27% of road related taxes (VRT, VAT on vehicles/Fuel/VRT, Road Tax, duty on fuel, etc.) were being spent on the development and maintenance of our road infrastructure.
I am sure that this percentage must have increased since then because we have accelerated the development of new dual carriageways - I think of motorways as being at least three lane roads like the M1, M4, M25 etc. in the U.K.
If we assume that the rationale for tolling roads is that the user pays, then I think that is a good idea.
However, I believe that we should not have to pay any tolls until all of our road related taxes are being spent on the road infrastructure. Preferably spent effectively and efficiently, where there is a clear return and we get proper value for money.