You make a good point (that people don't believe that the funds will be used responsibly). I prefer the "carbon fee & dividend" scheme, where every dollar extra that gets collected at the pump gets refunded to citizens or state residents. I'm also biased because I know I'm cheap, but the world is full of spendthrifts, so I will personally come-out ahead
johnlocke wrote: Taxes on gasoline were supposed to be used to fund road repairs. How did that work out?
It worked-out miserably, but not due to "politicians redirecting the money": rather, nobody could ever increase the gas tax (because politics), even as cars consumed less gas per mile, and the amount of money collected per gallon got smaller due to inflation, and the price of road repairs increased much faster than inflation. It got to the point where the gas tax is not even half of the money spent on roads & bridges by my state (MN).
In my state, gas tax generated $0.9 bn in 2018 but the Trunk + County + Municipal highways and bridges it funds used-up $2.95 bn.
In my state, you _could_ accurately complain that 3% of the gas tax money goes to non-road/bridge things like ATV trails and tax collection, but for every dollar of gas tax "siphoned off" to pay for these non-road uses, there are $58 which were collected other ways (e.g. sales tax), but got "siphoned IN" and lumped-together with the gas tax to pay for the roads and bridges.
Maybe other states fund more things with gas tax, but you'd need a crazy high gas tax to actually collect more money than is spent on roads & bridges. If MN ($0.286/gal) collected the same per gallon as CA ($0.5522/gal), MN would still come up short when it's time to pay for roads, if it wasn't also taking money from other places.