I"'e never understood the "your shadow points to the danger" idea. In this photo, the shadow is in front, meaning the sun is behind both you and any driver behind you. Unless the driver is blinded by his mirror (unlikely), this is a good scenario. It's when you cast a long shadow behind you, which you obviously wouldn't know, that you're in danger.
That said, low sun at prime commuting times is a real issue, and I prefer to remind myself that if the sun is blinding me, it's blinding the driver behind me too.
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