 The warning period, it's over. Tickets are now going out to drivers who pass stopped school buses in D.C. About 25 city school buses have been equipped with cameras that turn on when the buses stop arms are out and when their red lights are flashing. The District Department of Transportation says it issued over 170 warnings during a 45-day period that just ended. In D.C., most students rely on Metro while students with disabilities often take buses.