Stubborn banks of snow have forced pedestrians like me into the streets. The increased interaction with vehicles has confirmed my longstanding prejudices. The driver of a rusty Taurus is invariably courteous. The person behind the wheel of a Lexus, however, will often act as if they don't even see me. Owners of Smart cars are generally nice. Oversize pickup trucks and SUVs usually mean trouble. And when I spot a shiny Mercedes coming at me I know to immediately dive for cover.