Abstract: The specification discloses a seatbelt-activated operator restraint/control lockout system (40) which is particularly adapted for use with industrial vehicles such as skid-steer loaders. A pivotal arm (46) connected to one side of the seatbelt (36) is moveable between a forward position corresponding to the seatbelt being fastened, and a rearward position corresponding to the seatbelt being unfastened. The pivot arm (46) is normally biased by a spring (74) to the rearward position, and means (70, 78) are provided for selectively locking out a control valve (86) against operation except when the pivot arm is in the forward position. A second embodiment (112) of the invention is particularly adapted for use with solenoid-activated control valves.