Originally Posted by Jeff Wills

I'm a cautious, considerate, careful driver in a place where there's cyclists of all types and stripes (Portland) and I'm still surprised occasionally by a cyclist I "didn't see" until I was almost on top of them. It's a matter of contrast, color, and motion- too many times it's a person wearing "useful" gear that does not stand out from the background. I hate dark blue rain jackets in particular.

In order to avoid you, first they must see you.