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There is a section of I-70 in Colorado that experiences temporary closures due to severe sun glare at certain times of the day and year. https://www.codot.gov/travel/sunglare

Couldn't tell you where I've read this but I heard years ago that it makes a difference indeed. Now I'm wondering if that was just the person who said or wrote it just giving an example of what kind of considerations you need to incorporate when optimising for safety, or if they actuality had data on this

I was on a bike stopped at a stoplight and was rear-ended by a car for this very reason.

As a young driver I was given the advice that if you see a lot of oncoming cars using their sunshade or squinting into the sun as they come towards you, it's time to pull over and wait it out.

Driving with the sun at your back is never a good time to be on the road.

Crossing the road as a pedestrian neither.

Yes

Perplexity thinks yes. https://www.perplexity.ai/page/Do-Car-Crashes-kmZIsMnbR4qcdx...