A vehicular control mode signaling system includes a Driving Automation Level Electronic Control Unit that is communicatively linked to a vehicle computer and a signaling unit that is disposed along the vehicle. The control unit includes a processor, a vehicle controller, an interface controller, and a memory. The processor determines a vehicular control mode based on a comparison of a stored automation nomenclature and operating information received from the vehicle computer. The signaling unit includes at least one signal light that is disposed along the vehicle, and a transmitter that are selectively activated by the processor based on the determined vehicular control mode.