A computer-implemented method, a computer program product, and a computer system for sensor-based acknowledgments between road traffic participants. One or more cameras on a vehicle identify a gaze direction of a driver of the vehicle. The one or more cameras identify a focused eye state of the driver. One or more object recognition sensors on the vehicle identify objects around the vehicle. The computer system determines whether an object is identified in the gaze direction. In response to the object being identified in the gaze direction, the computer system instructs a light indicator to emit light in a direction toward the object. The light indicator notifies a traffic participant associated with the object that the driver has seen the object.