Ah... I had another post confused for yours. So what's the solution to fund the roads when EVs comprise too many cars and to fund the grid when too many people with solar don't pay into it due to NEM and are using the grid as a battery? The the grid is funded by kWh sales, and the roads are funded by a tax on gasoline. What funds the roads and grid when those sources are gone or too diminished?
Basic infrastructure can be funded by a general tax. So, if CO2 has significant impact on maintaining fixed basic infrastructure (e.g. CO2 causes more acid rain that erodes road surface faster leading to higher repair/maintenance cost) then the incremental cost will be reflected in general tax and shared by all. EV incentives will offset such cost for people that choose to buy EV's.