I had a guy who wanted to follow me a few years ago in the middle of the winter at night. He had no lights, I had an HID.
I went pretty slow, and looped back to pick him up twice. On the 3rd time I stopped and looped back quite a ways and waited for him but never saw him again. I mean, I was slowed down to about 10 MPH and he still wasn't keeping up.
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Work: the 8 hours that separates bike rides.