Isn't this one case where some campaigning from the Alzh Soc could help? As we all know, the majority of the general public are pretty clueless about the day to day, practical realities of dementia. To most people it would seem obvious that if the person's mobility isn't good enough to manage the distance to and from the car park, then you just drop them off - where's the problem? They can't imagine a scenario where the person will almost immediately forget that you are coming back soon, will not have a clue what is going on, will become frightened/agitated/panicky, and very likely wander off. There was absolutely no way I could ever have dropped my mother off at the optician's on a very busy high street. On two such occasions I had to arrange taxis. For some reason she was also frightened of being in a wheelchair, so that wouldn't have been much help either.