If i am using a real toilet their i like to shut and lock the door and have privacy let face it that rare, however if im having an out of toilet pee their i don't care whom see me and if they don't like it don't look!
As a female lorry driver (well sometime) i can assure you that most of us will pee in public too but their not many off us, some days i will make 6-8 layby stops