This is more interesting than the Movies themselves.. Steve McQueen did a lot of his own Stunts.. and yes he wanted to do the Motorcycle Jump in the Great Escape it was his idea to put it in the script.. The Great Escape is based on a real Prison Escape but had no motorcycle chases.. McQueen was simply a hard core Motorcycle racer.. Dessert races ect.. To avoid Injuries to Steve he recruited his racing buddy and Triumph Motorcycle Dealer Bud Akins do to stunt in both Movies.. Bud jumped over the fence and did a lot of the driving of the Mustang in Bullitt ..