As I wrap up my week in Boston and prepare to return home, I am sharing my observations and thoughts regarding Boston-area bicyclists, who contend with high-density, generally low- or moderate-speed traffic and some very rough roads every day. I saw a fair number of wrong-way cyclists, alot of red light runners, numerous sidewalk cyclists, and lots of transportation cyclists. About 30 percent of the cyclists I saw were riding fixed gear, both genuine track bikes and conversions, which I suppose is a response to slippery roads and a lack of steep hills.