>What about automobile roads and highways? >If there's any, on a mile-per-mile basis, it's probably <0.001%. US highways do pay for themselves <https://web.ar

>What about automobile roads and highways? >If there's any, on a mile-per-mile basis, it's probably <0.001%. US highways do pay for themselves <https://web.archive.org/web/20170712175437/www.rita.dot.gov/bts/sites/rita.dot.gov.bts/files/publications/federal_subsidies_to_passenger_transportation/index.html https://web.archive.org/web/20170712175437/www.rita.dot.gov/...>, and help pay for other modes of transportation. Transit receives the biggest subsidy per passenger-mile, with rail and airlines in between. (For those wishing more detail: From the executive summary <https://web.archive.org/web/20170628114204/http://www.rita.dot.gov/bts/sites/rita.dot.gov.bts/files/publications/federal_subsidies_to_passenger_transportation/html/executive_summary.html https://web.archive.org/web/20170628114204/http://www.rita.d...>: >*Highways* >* Users of the highway passenger transportation system paid significantly greater amounts of money to the federal government than their allocated costs in 1994-2000. <https://web.archive.org/web/20170628114204/http://www.rita.dot.gov/bts/sites/rita.dot.gov.bts/files/publications/federal_subsidies_to_passenger_transportation/html/figure_01.html https://web.archive.org/web/20170628114204/http://www.rita.d...> This was a result of the increase in the deficit reduction motor fuel tax rates between October 1993 and September 1997, and the increase in Highway Trust Fund fuel tax rates starting in October 1997. >* School and transit buses received positive net federal subsidies over the 1990-2002 period, but autos, motorcycles, pickups and vans, and intercity buses paid more than their allocated cost to the federal government. >* On average, highway users paid $1.91 per thousand passenger-miles to the federal government over their highway allocated cost during 1990-2002.)