Race car drivers almost never have to urinate because racing dehydrates the driver. A far greater issue for drivers wearing multi-layer racing suits, gloves, and helmets in a hot cockpit is maintaining hydration to replace fluids which are sweated out rather than expelling fluids. Typically, the last two things one does before climbing in a race car are (1) go to the bathroom and (2) take a large drink of fluids.
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NASCAR drivers go to the restroom before a race begins so they don't have to go during the race, if they do have to go during the race they'll will just have to wait until after the race is over to go. They won't just stop racing to use the restroom because they're racing for their paycheck.
Racing drivers generally don't have to urinate during races because driving a race car dehydrates you. Typically, the last two things a driver does before a race are (1) urinate and (2) drink fluids. suffice it to say though, that in the unlikely invent a driver needs to urinate during a race, he will not make a pit stop to do so.
Usually no. Racing dehydrates drivers, and they expel fluid wastes through sweat.
I actually heard a Nascar driver answer this one. Generally they do not, but there have been occasions.