Today is a special day in the history of the Interstate Highway system.
It has been exactly 90 years that on september 6th, 1919, the first Transcontinental Motor Convoy has reached San Francisco after 62 days of driving from Washington D.C. Everything west of Illinois was not paved, and often only dirt tracks.
Dwight D. Eisenhower was on this convoy, and his experiences with the German Autobahn system have propelled the creation of the Interstate Highway System as we know it today.
http://en.wikipedia.org/wiki/Transcontinental_Motor_Convoy (http://en.wikipedia.org/wiki/Transcontinental_Motor_Convoy)
There was a re-enactment of the 1919 convoy (http://www.pittsburghlive.com/x/pittsburghtrib/news/westmoreland/s_629254.html) this past summer.