Can Someone Please Explain This To Me...

... without resorting to "they're misogynistic?"

From Hashkafah.com:

I am aware that I am not the only (ex)chasideste on H and I was wondering what you all feel about women driving. Here in London a child who's mother drives will not be accepted into a chasidishe chieder or school. It is preferred that women use (arab) taxi drivers - regardless of the length of their trip, and no one blinks if a family has an account with a specific firm who will send them the same driver whenever he is available, which effectively means that women will be taking trips as long as an hour in both direction (from stamford hill to the west end [shopping district] or other malls even further away) with the same man, fairly often.

I am at a loss to understand (i.e. what's the halachic (or "minhagic") for the prohibition (or disapproval) of female driving among some Chasidic groups. It can't be an issue of tznius, since a woman is no more exposed when getting out of the front seat of a car than when getting out of the back seat.

In fact, I would think, based on the author of the quote above, that having women take a car service repeatedly with the same non-Jewish man over and over again can present possible violations that are certainly worse than could be possible if a woman were driving alone in her car.

Obviously, for the Chasidic community in London, this is a big deal. The fact that they're willing to keep kids out of school because of this (a stupid idea, IMHO, but that's for another day) clearly says that they consider this issue to be very important. But, assuming that they're not all misogynistic idiots (I refuse to believe that all Chasidim are that way) then what is the basis for the restriction?

The Wolf