Doriot drove for Peugeot in the Grandes Épreuves of the 1890s, consistently finishing near the top after many hours of competing on unsurfaced roads in difficult conditions. On 22 July 1894, he finished third in the Paris-Rouen Trail, covering the 126 kilometres in seven hours. In 1895 he finished fourth in the Paris–Bordeaux–Paris Trail, carrying three passengers for the 59-hour race. In 1896 he finished eighth in the ten-day Paris-Marseilles-Paris Trail, covering the 1,710 kilometres in 81 hours. In 1897 he finished 29th in the Paris-Dieppe Trail, taking six hours for the 170 kilometres. He finished seventh in the 1898 Paris–Amsterdam–Paris after taking 36 hours to cover the 1,431 kilometres. In 1899 he was second in the Paris-Saint Malo trail and 10th in the Paris-Ostende trail driving Peugeot voiturettes. In 1900 he finished fourth in the Coupe des Voiturettes averaging circa 36 kilometres per hour.