In September of 2008 cyclists from around the world will gather on SR305 outside of Battle Mountain, Nevada for the 9th consecutive year to race on one of the straightest, flattest, and smoothest surfaces in the world. The 4,619ft (1,408m) altitude road allows riders an acceleration zone of over 4 miles, enabling them to reach their maximum velocity before being timed over a 200 meter distance.
I'd love to visit this event some day, seeing cyclists pushing their HPV's to over 100kmh would be simply amazing!
http://www.wisil.recumbents.com/wisil/whpsc2008/speedchallenge-2008.htm