That Michael Myers could drive a car despite having been committed to an asylum at the age of six inspired many guffaws. The first movie novelization came up with a simple but effective explanation: when Doctor Loomis drove Michael to sanity hearings over the years, Michael simply watched very closely and carefully as Doctor Loomis operated the car. Remember, even if Michael sat in the back seat and there was a screen of bulletproof glass partition, Michael could still look over the Doctor's shoulder without Loomis realizing the significance. Alternatively Halloween: The Curse of Michael Myers (1995) provides a retroactive explanation to this question.