Abstract: An alarm system for vehicles such as school buses which forces the driver to walk through the vehicle to silence the alarm at the end of each route so that he will detect the presence of passengers remaining on board. An ignition relay is energized whenever the ignition switch is on. An arming relay for the alarm is energized when the door switch of the bus is first activated. An override relay is also energized when the door switch is first activated. Alternative circuits for the arming relay include one set of the override relay contacts and a disable switch for the alarm located at the back of the bus. The alarm sounds when the ignition switch is turned off and can be deactivated only by depressing the disable switch at the rear of the bus.