A design is disclosed for a stop signal light emitter and receiver which together enable simple automatic stopping control within designated spaces for moving entities like vehicles, robots or drones, while the transmitted signal remains clearly visible to animals or people. The motivation is to provide a minimum design and standardized spatial signal for safe operation of vehicles and machines and movement of animals and people where a stop signal is linked to a local spatial area. The local spatial area of the signal emitter is linked via transmission from an emitter which is part of a signaling device (where the signaling device is a traffic light or brake light for example), to a receiver where there signal is detected by optical and or photoelectric circuitry.