16èmes Grand Prix d'Endurance les 24 Heures du Mans 1939

Originally, there were no rules on the number of drivers in a car or how long they can drive. Although almost all teams used two drivers in the early decades, some Le Mans drivers like Pierre Levegh attempted to run the race themselves, hoping to save time by not having to change drivers, although this was later banned. Up until the 1980s there were teams where only two drivers competed, but by the end of the decade it was placed into the rules that at least three drivers were necessary.

By the 1990s, due to the speeds of the cars and the strain it put on drivers, further rules were put in place in order to aid in driver safety. Drivers could not drive more than four hours consecutively, and no one driver could run for more than fourteen hours total. This has reduced driver fatigue during the races.