During the first 10 of my 13 mile route in to work, I almost never see other bikes (except for "local traffic," kids etc.). When I approach downtown, there are a couple of people I frequently see and wave to, but they're across four lanes of traffic so conversation is out of the question. On the last leg I'm on one-way streets. There are a couple of people I see frequently -- a runner and a guy on a 'bent -- and we sometimes exchange pleasantries if we happen to match pace for a moment.
Most of my "regulars" are people like school crossing guards, the guy who sits outside his comics shop, the newspaper seller who works the cars at 34th & Grays Ferry -- people like that who I see every day, and always have a sile, a wave, or a word about the weather.
Coming home at night, it's pretty much nada.
RichC
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Training: 2002 Fuji Roubaix Pro (105 triple)
Commuting/Daytripping: 2001 Airborne Carpe Diem (Ultegra/XTR, touring wheels)
Commuting/Touring: 2000 Novara Randonee (Sora/Tiagra/LX, fenders, lights)