Nothing circular about it. I don't believe in making people pay twice for things. If you want to replace the gas taxes with tolls on existing highways that's a different conversation. I don't have a problem with tolls on new highways. Take the 6 billion public dollars earmarked for the 413 and spend it on transit.
Swell; but they haven't paid for them once yet.
The highways were largely debt-financed, and money raised through gas tax, and municipal tax only (maybe), barely, covered the carrying cost of capital construction.
It did not cover the cost of on-going maintenance and operation, nor indirect costs.
There's the obvious, the healthcare and policing costs associated with accidents; less obvious the costs in pollution.
But something most are completely oblivious too..........the opportunity cost.
All that land not subject to property tax, not generating a useful economic return.
Very conservatively, the 401, in Toronto alone, occupies 1500 acres of land, including interchanges. I think you can safely assume Toronto's other highways add up to at least that much again.
Granting, that were that land available for development a chunk would go to local roads and parks......
You're still looking at (based on Toronto's average population density), space for 54000 people. (likely a whole lot more the way we build now)
The forgone property tax revenue alone is upwards of 100M per year, on the residential development alone.
Add in commercial, and its a whole lot more.