It's awful. As a lady of certain years and a mother this is a nightmare-in-waiting. In France, by the way, every new mum gets physio to re-educate the required wee-wee muscles (somewhere we fall short).
It happened to me once. I wriggled until it got darkish and then I simply had to get out of the car, swathe myself in impenetrable coats ....and wee (sheltered by the car door from one side).
If any govt. at any time cancels ladies' loos then they are out to control - believe me! It was G B Shaw who led the move for ladies' public loos and for that he demands sainthood!