Overall a pleasant commute in temps just below freezing. Riding down a road I heard a funny sound from a car passing me - I could see right away that the rear passenger-side tire was flat. It was a super low-profile tire on a big rim, so I'm not surprised the driver didn't notice. I had a mind to pull up to the driver at the next light and alert him/her, but the light changed and the car pulled away before I reached it.

Later, I passed a guy on a fatbike, me on my skinny-tire fixie. The roads are mainly bare and dry (some frost on the trails), so I don't see the point in riding such a cumbersome beast, but I guess you'd get a good workout. We'll be getting snow soon enough I guess, and then he'll be riding and I won't!