On the road bathroom troubles

Why is it when I ask my daughter if she has to use the "potty or go to the bathroom" before we leave the house, or where ever we might be leaving she says no most of the time. Then within five to ten minutes of being in the car it starts, the whining. Which I recently read that children under the age of five do not even know they are whining, as parents we must point this out to them and be patient (this of course must have been written by someone who has children ALL over the age of five and has forgotten how horrible the whining can sound when you are closed in a car and there is no way to escape. )

Mix it with more whining ,"mommy I really have to go, I have to go to the bathroom now, mmmmmm oooooooo mmmmmm mmmmmm yyyyyy I have to ggggg oooooooooooooo. Well darling daughter of mine, do you think perhaps it would help if you stopped drinking your milk if you have to go so badly?

Now it is not like my daughter has not been potty trained for sometime already, plus I know when she is at school she holds it the whole time. So pray tell why is it without fail every time she tells me she has to use the potty when we are in the car we are NO where near home, or any place that I would consider suitable to stop for a bathroom break? Do I take a chance that she will make it or do I look for somewhere besides the trees?

To boot on our recent out and about bathroom stops she not only has to do number one but she is doing number two. I know who cares really right? Well let me tell you number two is a WHOLE big production. She takes off her skirt, or pants and undies included, tells mommy to either turn around or close my eyes, oops forgot to mention shoes come off first, and then finally she closes her eyes and one by one they start dropping except there is usually a minute to two in between. So all in all it can be ten minutes before we are done not including getting dressed again.

Another problem is, if someone else is waiting my daughter has no sense of time yet it doesn't matter to her, I on the other hand feel bad. What am I supposed to do, it really would not be right for me to tell her to hold them in until we get home and only make pee-pee now. She would be confused and I do not want her to need therapy later in life because I gave her bathroom issues or worse yet some type of dysfunction a fear of success because she now has fear and this fear escalated and then she became fearful of everything. See it could very easily be a whole snow ball effect. So being a good mother, or trying to be a good mother I am forced to face the "on the road" bathroom dilemma until further notice.