Abstract: Safety apparatus for vehicles, machinery, and the like to provide a distinctive signal in the event of the incapacitation or drowsiness of an operator. Spaced electrical conductors are supported on a hand-grip control means such as the steering wheel of a vehicle to provide thereby an open circuit which is capable of being bridged by a body portion of the operator such as the hand of the driver on the steering wheel during normal vehicle operation. An output means is also provided which gives a distinctive signal, and this output means is controlled by a circuit coupled between the conductors and such output means.