I relearned to ride a bike in San Francisco -- I discovered that bikes were about as fast as the local mass transit, but more reliable in terms of arrival at a destination. I enjoyed getting exercise while doing something necessary (visiting clients, friends, chores), not waiting for the next bus, streetcar, what have you, and putting one less car, even a mass transit car, on the road. In Virginia I can bike to the office in about 30 minutes. Takes 15 minutes to drive, so for the "cost" of 30 extra minutes I get an hour of aerobic exercise, and the feeling that I'm helping reduce the fossil fuel consumption and CO2 production (though, to be honest, only very slightly). I'm constantly aware, however, that it's dangerous. Despite my urban riding skills I realize that some car, truck or SUV can end it all for me. The local roads make sharing the road a challenge.
San Francisco bound