I stopped to talk to a guy who was pulled off to let me by once; he was without light or reflector, and he thought I was a car because of my halogen. I offered to light his way, and he accepted. However, he couldn't keep up. I dropped my speed to about 10 from my usual 16, and I looped back 3 or 4 times, but the last time I went back 1/4 mile and still didn't see him, so I just went on. This was in the winter with a snow cover.
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Work: the 8 hours that separates bike rides.