The only race at the time to regularly carry the name Grand Prix was organised by the Automobile Club de France (ACF), of which the first took place in 1906. The circuit used, which was based in Le Mans, was roughly triangular in shape, each lap covering . Six laps were to run each day, and each lap took approximately an hour using the relatively primitive cars of the day. The driving force behind the decision to race on a circuit - as opposed to racing on ordinary roads from town to town - was the Paris to Madrid road race of 1903. During this race a number of people, both drivers and pedestrians - including Marcel Renault - were killed and the race was stopped by the French authorities at Bordeaux. Further road based events were banned.