When NASCAR drivers have to go the bathroom they hold it in. A famous case would be Kurt Busch in the 2005 Daytona 500 and the end of the race he ran to the bathroom. Now if it's in an emergency they have to go in their cars, and this is where having a yellow fire suit helps. Now if it's more serious than a really bad wee then they better hope for the checkers or a red flag. I don't know about today [MUCH shorter race duration times], but in the "old" days, a few drivers who didn't want to "hold it," used a "relief tube." Relief tube is a common term for a urinary catheter. They got the idea from long duration solo pilots in the old days of aviation, with who relief tube systems were common. A urinary catheter system consists of a small tube which is inserted through the urethra into the bladder, which continuously drains urine as it is produced by the kidneys. The tube is connected to a catch bottle, sometimes worn attached to the users leg. As for bowel evacuation, I guess they just have to hold it, OR like the astronauts, wear a diaper, and hold off as long as possible. usually a driver sweats it out.
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Somebody from ask.com says that they sweat it out because it is so hot in the cars and they can pretty much sweat out all their liquids. But if they go, they just have to go, fire suits can be washed.
They go before a race. There is no way to go in the car. If they really have to go, they just go down pit road and stop their car and go to a normal bathroom. But I've never seen it happen.
Having to use the bathroom while in the car is not usually an issue. The heat inside the cars sometimes reaches as high as 150 degrees (hence the "fire suit"), so the drivers are more likely to dehydrate.
Usually it's 130 to 140 degrees in the car. You could sit in a sauna and drink all day long and not go to the bathroom. That is pretty much what happens with the drivers because you are in such a hot environment. And in the rare occurrence that they have to go, they just go in their suit.
they take shifts so when they need to go to the toilet they switch drivers
^ they do not take shifts they take the needed precautions before the race and if they absolutely have to they go on themselves
Actually, they don't need to urinate during long races: when your body is in a high-temperature situation like the inside of a race car, your kidneys slow down urine production so there'll be more water for sweat.