Abstract: A device forms a wedge shape and is operative to be placed between a control surface and the underside of a rotating control knob. A frictional coating is applied to an upper and or lower surface of the wedge to improve resistance to rotation of the knob, and to maintain an inserted position of the wedge. A tab extends from a trailing end of the device to facilitate insertion and removal. The tab may include two portions hingedly connected to the upper and lower surface of the body, and the body includes a biasing member which urges the surfaces and portions apart. The wedge may be formed with resilient material, to increase friction and provide utility for a wide variety of gap sizes. A plurality of wedges may be interconnected to facilitate connection to control panels with a plurality of rotating controls.

Abstract: A safety system and method for school buses in which sensors are associated with each seat to sense if a person is occupying the seat and if the seat belt is buckled. A display, within the vision of the bus driver, shows the condition of each seat. Sensors determine the head count of students on the bus. An alarm signals a mismatch between the head count and seats occupied. A telecommunications link and a global positioning system provides bus location to a remote station. Additional sensors detect shook, heat, smoke, CO, water and tire pressure.

Abstract: A safety system and method for buses, and in particular school buses, with the bus having a plurality of seats arrange in rows with at least one aisle running lengthwise of the bus, and a forward seat for a driver, and a door through which students enter and leave the bus. A sensor is associated with each seat to sense if a person is occupying the seat. A safety seat belt and buckle member enable a person seated in a seat to buckle in for safety. A sensor senses if the seat belt is buckled. The condition of each seat is read to determine if the seat is occupied and the seat belt is buckled. A display, within the vision of the bus driver while normally operating the bus, shows the condition of each seat. A telecommunications link is provided between the bus and a remote station and can be operated by the bus driver while normally operating the bus. A global positioning system coupled to the telecommunications link provides to the remote station the location of the bus.