Just yesterday morning I nearly mowed down an uphill rider on the singletrack. Ok, he was still a ways off but I was facing almost directly into the very early morning sun, sort of squinting to keep from being blinded. His lime green and navy jersey coming from the sun's direction just looked like the flickering shafts of sunlight between the trees. I stopped in plenty of time but felt like a heel.

That pink jersey would have been more visible by far than the "high vis" green and blue.