I'm on the BxM4C bus from Manhattan to Yonkers Raceway for Motorcycle Safety School. The bus is full of night workers coming off their shift. Everyone knows the driver's name, and vice versa. As we cross into the Bronx and stop at a light, the low morning sun slants into the front. The driver (Dave) gets up and pulls down the sunscreen over the passenger side of the windshield. 'Let me get this for you, Roz' he says to the young woman in the front seat with a green spiral tattooed on her earlobe.