A system, for use at an autonomous-driving-capable vehicle, including a processing hardware unit and a tangible interface device. The system further includes a mode-determining module configured to, via the processing hardware unit, determine an applicable interaction mode corresponding to a driver of the autonomous-driving-capable vehicle. The system also includes an interaction module configured to, via the processing hardware unit, perform various operations. The operations include generating system messages having content based on the applicable interaction mode determined and related to autonomous-driving activities of the vehicle. The operations also include transmitting, by way of the tangible communication device, the system messages to a tangible interface device of the autonomous-driving-capable vehicle for communication to the driver by way of the tangible output device.