Sometimes, during Winter, the sun can get really low in the sky. Low enough that putting my visor down in my car doesn't block it. Is there any way to drive safely in these conditions?
The most important factor with very low sun angles is to make sure the windshield is very clean, both outside (easy) and inside. Cleaning the inside with glass cleaner and paper towels will remove a surprising amount of film that, if left on the glass, will scatter light, obscuring background objects (like the ones you're trying not to collide with) when strongly backlit.
The same applies to glasses or sunglasses you might wear; the dirtier the lenses are, the more the sunlight will glare in your eyes and obscure objects.
In the extreme case, park for ten minutes -- at least in temperate or tropical latitudes, if the sun is so low you can't block it at all without blocking everything, it'll be gone in that amount of time.
I use 3 methods (in decreasing order of preferability and safety):
- Sunglasses. Preferably polarized ones, these reduce the sun's glare without making everything else too dark.
- A baseball cap: I can usually angle it to block out the sun without blocking too much else. Works reasonably well for highway driving, not so much in city traffic (you have to adjust every time you change direction).
- if all else fails, I hold up my hand to block the sun. Not as safe and you can't do this long, but better some vision than none at all.
Personally, I find that my brow protrudes just enough that I can turn my face downwards then raise my eyes to see the road ahead with the sun blocked by my brow bone. Most people I suggest this to say it doesn't work though, so maybe I have a little more Neanderthal DNA than most.
Sunglasses always seem to make it worse in my experience.