Everyone with kids under the age of 10 should appreciate the wisdom of this invention.
There is absolutely nothing more frightening than being on the interstate 50 miles from the next rest area with a kid in the back screaming, "Mom I have to go NOW!!"
That's a good point, Icequeen.
We did take our daughter's little potty with us when she was still potty training and we were driving across the country.
We had liquid hand sanitizer and hand soap and a five gallon jug of water for cleaning the potty and washing our hands. We used it a few times, but we made a point of "trying" at every rest stop along the way.