Your parents may have intended on driving as far as they could on whatever gas was already in the car without stopping. Given that if you didn’t try and go at that point you may have been uncomfortable for a few hours because they didn’t plan on stopping! If you had to go within the next hour TO BAD. You were given a chance and told to try anyway.

Good thing you admitted that you are too young to have the wisdom to never pass up a chance to pee.

This never works when my wife says she doesn’t want to have sex, and I tell her to try anyway