School is back in session and the New York Association for Pupil Transportation is urging the motoring public to stop for stopped school buses. It's the law when a bus comes to a stop and its red lights are flashing, motorists must stop.  The group says on any given day more than 50,000 motorists in New York will pass a stopped school bus and endanger the life and welfare of a child.  Motorists that do no stop and are convicted of the moving violation face fines ranging from $250 to $400 for the first violation, possible jail time and five points on their license.