Where I live, this is a real problem, we have a lot of sharp short hills with the crest above the skyline, so coming up the hill at this time of year and the sun is full in your eyes.
Many times, bikes have been coming the other way and it is difficult to see them. Accident stats show that many accidents occur within 10 mins of leaving home, people fiddling with radio's, makeup, on phones etc.
I can't understand why so many people drive with misted windscreens

What is true is that you need to be aware of the environment and the dangers...