Are you a good driver? Consider the speed limit, leave enough space to the car in front of you, never look at your phone? I wouldn't want to drive next to 90% of drivers, but i sometimes have to.
Why do you think people on a train are loud, smelly and inconsiderate? I made the opposite obelservation. I met the greatest number of inconsiderate people on the road. Can't say if they were smelly, but their cars sure were loud.