Bedford Autodrome Duathlons - fast and flat draft legal sprint duathlon. The Bedford Autodrome Duathlons are based around the beautiful and historic Thurleigh Airfield. Now turned into a motor racing track you will be treated to a 5km run around the smooth, pan-flat race circuit, then back into the 'pit lane' for transition to your bike, followed by a pan-flat but technical bike course, finishing with a 2.5km lap of the race track to finish.You will love it, it's truly fantastic and totally traffic free!