Only 3 states Delaware, Montana, and New Jersey raise enough revenue from cars to fully cover their highway spending.
The remaining 47 states and the District of Columbia must make up the difference with tax revenues from other sources
By diverting general funds to roadway spending, the burden of paying for the roads falls on all taxpayers, including people who drive very little or may not drive at all.
Source: https://taxfoundation.org/data/all/state/state-road-taxes-funding/
I do think it’s important to reject the neoliberal demand that all services pay for themselves. I think a heat map showing percentages of local/state and federal funds spent on non-car transit infrastructure would be more useful and interesting. Or, a heat map showing the percentage of roads in each state which the state is currently able to afford upkeep on. As the big issue with our road funding model is that it’s easy to build, almost impossible to maintain.