NASCAR Racing: urinating, emergency room nurse, containment systems

Question
My family and I are committed NASCAR fans,,, we rarely miss a race, and my Dad watches the truck races when we are working. We have a question about the drivers while they are driving. The drivers are in the cars for a very long time, sometimes up to 4 or 5 hours at a time. We know they have to stay hydrated, however, after awhile I'm sure they have to relieve themselves,,, we were wondering just how this happens? We did come up with the thought that maybe they have a tub hook to a bag taped to their leg or something..... thank you for your help

Answer
Ahh, the old "what do they do when they gotta pee?" question. I get this one about once a year.

OK, first, most of the races are 3 to 4 hours of actual "car" time and most of us are able to go 3-4 hours without wetting ourselves. I am an emergency room nurse now and often go 6 or more hours without having time to get to a bathroom.

Second, at most races it is so hot inside the cockpit that drivers can lose anywhere from 5-15 lbs of perspiration (Richard Petty was tested once in the mid 70's and as skinny as he was he lost 15 lbs in one race). So that loss of fluids helps to keep the bladder level down.

And third, if all else fails there have been incidences when the driver just has to wet himself, there are no in car bags, empty bottles or urine containment systems.