Regarding 'probably more'... The needs of the privileged minority do not outweigh the needs of the many. Paying more income taxes on an individual level does not mean their proportional tax contribution to society is higher than the lower earners and the less wealthy, nor does it mean that their overall societal contributions are proportionally greater.
I say that as someone who thinks the highest marginal income tax rates in Ontario are too high.
Take this with a massive grain of salt because this is Vox and data is from a book on the US, but Canada isn't that far off. Tax burden as a proportion of income:
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The tax system is not as progressive as income taxes would suggest. Just because a cottage owner contributes more taxes in absolute figures doesn't mean they should get a bigger say than the majority of non-cottage owners, some of whom can only afford public transit.
Back to highways, the current plans for expansion seem fine. I think it's genuinely hard to argue that the GTA is lacking highway capacity given the plethora of ongoing and confirmed highway widening and expansion projects.