An unusual but insightful answer to a question usually asked in insult.
If your car can’t go faster than 55, you’re not angry and impatient with the people you want to pass (all none of them). I tested this theory by driving on 101 with the cruise set to 65 and, even in traffic, I didn’t have to do anything. Other than being boring (because our car *can* go faster), it was very relaxing.