This afternoon as I was leaving work I stopped to check the traffic as I always do. When the cars cleared there was nothing but another bike about a block or so away so I pedaled out trying to get my engine warmed up to the idea of carrying me home. Suddenly I hear an echo from my left and realized I am being passed by another rider on a China Girl bike. I never realized the oncoming bicycle was motorized and because of its narrow profile didn't register how fast it was moving. We are increasing in numbers so I guess the lesson is "Don't assume!"