Busses are part of the public transportation infrastructure, just like roads, sidewalks, bridges and everything else. It's weird that they aren't fully subsidized.

But roads aren't fully subsidized. That's what the gas tax is for. Drivers of electric cars are currently free-riders, which is something that will have to be addressed if they become a significant fraction of drivers.

Electric cars are technically still taxed on electricity, registration, and purchase. They shouldn't be taxed further until other cars are forced to pay the full cost of their effects including NOx and CO2.

Those taxes are not specifically for roads like the gas tax is.

We will at some point have to do a total rethink of how we pay for roads.