Nothing like resurrecting dead threads. But since nobody posted what I think is the right answer, I'll share mine.
It's my take that the reason for the weird driving habit is that they were killed by the accident. So that scene does not play by the rules as soon as the impact happens. The ending helps explain it, but that doesn't help the movie if people walk away from what is such a boneheaded move.
As for someone else saying how daft it was she didn't know where the wiper controls are, it was a rental car. The smart thing to do when renting a car is to become familiar with all the controls. Some people don't do that though. I felt like that was dumb too, but at least they did explain it. It wasn't necessary though.
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