Someone told me how he cheated on his driving test. He twisted the passenger mirror down, so that he could clearly see the curb during the parallel parking part of the test. When the instructor asking him about the mirror, he lied and told her it was broken.
Perhaps there could be a small market for a downward positioned additional mirror on the passenger side. It would enable those who continue to struggle with parallel parking to get a clear view of the curb without sacrificing their usual passenger side mirror view.
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I like this idea. You actually might integrate it as a two-mirror stick-on - the other being the standard fish-eye mirror.
Btw, you can pretty much use those fish-eyes to achieve what you describe - if you know to do so.