Villoresi was critically injured while testing a Lancia Aurelia near Rimini, Italy in April 1954. He was riding with his mechanic when he skidded while attempting to avoid a Fiat driving in the opposite direction. Both Villoresi and his mechanic were pinned beneath the Lancia. A group of farmers came to their aid, using oxen to lift the car. Both men remained conscious. Villoresi sustained a number of deep head wounds, facial lacerations, and bruises all over his body. He was listed in serious, but not critical condition.