Money drivers directly give towards roads - gas taxes, fees, tolls, etc. - cover 30.6% of what we spend on roads. This puts Colorado 24th in the country by that measure, according to the Tax Foundation. Put another way, $7 out of every $10 spent on roads here comes from the general population regardless of how much they use the roads. As cars get more efficient and gas stays cheap, less and less of that is going to come as a use fee (gas tax).

People can complain about the 'war on cars' all they want but the more viable alternatives that exist to driving alone, the LESS YOU WILL PAY for other people to put soot and CO2 into YOUR air, clog YOUR streets, add stress to YOUR commute and every year take more and more money out of YOUR pocket. It doesn't matter how you get around, fewer people driving alone if better for everyone.

http://taxfoundation.org/article/gasoline-taxes-and-tolls-pay-only-third-state-local-road-spending