Where do race car drivers relieve themselves?

Answer 1

They don't! You have to be sure to go before a race, and MAKE yourself go even if you don't feel like you have to pee because as soon as you strap in to that harness, your bladder is getting squeezed. If you are doing a long endurance race / through the desert / through the night, etc, etc it's not uncommon if it's an "emergency" to just go (number one of course) and worry about cleaning the race suit later. I cant imagine ever having a number two emergency and then sitting in that for hours....ewww. :)