This is a common carbrain argument
“I already pay the gas tax”
The problem is that it’s false.
In a recent study, researchers Stefan Gössling, Jessica Kees, and Todd Litman calculated the social costs of driving. They found that the social cost is about 30-40% higher than what car owners are actually paying
https://www.sciencedirect.com/science/article/pii/S0921800921003943?via=ihub
That cost is paid by non-drivers.
Thing is, you haven’t paid it with your taxes either. A lot of the costs haven not been paid yet at all, much of it is financed by debt, and also those who don’t use the road in the region pay for it nonetheless.
That’s splitting hairs - usually the debt is financed by defining a revenue stream to pay it