That's a fairly contentious subject. Yes, fuel taxes often pay for roads; but they also are used for other purposes, as well as to incentivize behavior. Trying

That's a fairly contentious subject. Yes, fuel taxes often pay for roads; but they also are used for other purposes, as well as to incentivize behavior. Trying to reduce carbon output? Make carbon-based fuels more expensive to purchase, and let the market optimize for alternatives.