Originally Posted by
chasm54
Seriously, if you are properly lit - and people underestimate the importance of reflective clothing, it can be seen from miles away - you are less at risk in the dark than at some other times of day. The most dangerous moments are dawn and dusk, when drivers are most likely to be dazzled by low sun, and the light conditions are such that lights etc. may not show up as well against the background. That's not to say I won't ride at dawn and dusk, but I'll take care to notice where I am relative to the position of the sun and make decisions accordingly.
In my estimation, riding through tree shadows in strong sunlight, and riding into the setting or rising sun are two of the most dangerous environments for a rider. In the latter case, the problem can be exacerbated by dirty, smeared windscreens on vehicles approaching from behind.
Likewise, I will be more cautious in noting these conditions and making appropriate decisions.