Would be great if that was the case in the UK. Currently road tax, or Vehicle Excise Duty is related to CO2 emissions. Road upkeep is from general taxation. Road tax was abolished in 1937, I like to remind motorists of this fact when they say "cyclist should pay road tax". Although EVs now have to pay 3p per mile from 2028, which is a big change. Yeah the super-sized vehicles might pay more in fuel tax and have a higher VED rate, but nowhere near enough.