This is kind of a joke, but for me I am serious. Having a car significantly enabled my hypomania, when I wasn't on meds. I would go so far as to say that it was near half of my problem. People say to avoid things like coffee and alcohol, but in my case avoiding access to a car has been the most beneficial. I can be more self contained in that regard and just race around the maze that I make out of my house instead if a maze of roads.