Dog Folks wrote:
The instate was championed by Eisenhower after he saw the German Autobon system in 1919....
What's your source for that?
http://en.wikipedia.org/wiki/Military_career_of_Dwight_D._Eisenhower#Early_military_careerEisenhower did not go to Europe during or after WW1. He was part of a US military convoy that drove cross country in 1919 - following the incomplete Lincoln Hwy
http://en.wikipedia.org/wiki/Transcontinental_Motor_ConvoyAutobahn construction began in 1929, with the first section opened in 1932. It was preceeded by an Italian autostrada in 1924. But apparently Hitler's propaganda machine was effective - he is credited with inventing the Autobahn. A lot was constructed in the prewar years (1/4 of current mileage), but it wasn't all that useful for war purposes. Most German troop and equipment movement was by rail.
http://german.about.com/library/blgermyth08.htmThe Pasadena Freeway opened in 1940, as did the Pennsylvania Turnpike.
FHWA historyAccording to this, there was a 2cent federal gas tax that went to the Treasury. After the 1956 bill, the gas tax was 3 cents, and went exclusively to the Highway Trust Fund. By 1993 this tax had increased to 18 cents (29 cents in current dollars), and for about 5 years the latest increase went to debt reduction. Now the Highway Trust Fund gets infusions from the general budget.