Real simple, the registered owner of the vehicle receives the ticket...if they wish to contest it by stating that they weren't driving the vehicle, then they must provide who was driving their vehicle...then that person receives the violation.  As I recall, we already have this type of system for drivers who drive past school buses with their STOP arms extended for crossing students.  Their are heftier penalties when the driver can be identified, but when the SB driver is trying to do many things while loading the students, and it is quite often dark at the time, if they can get a license number then a lesser violation can be issued...same principal, if you weren't driving your vehicle...then tell us who was...