In this paper, we describe a robot-based interface for presenting important information to assist safety driving. We have been developing a safe driving support system consisting of various devices for sensing the in-vehicle environment and driver’s vital signals, a set of edge computing nodes for analyzing the sensed data, and actuators for presenting the analyzed results to the driver. Because visual and auditory messages are commonly used in an instrumental panel, an audio system, and a navigation system in the car, adding similar notification methods may hinder the driver’s safety driving operations. We, therefore, propose to use robot motions with voice messages as a new way of delivering important information to the driver. We designed and implemented two sets of the driver assisting methods using a real robot placed in a vehicle and a visual robot aid moving on a monitor screen. We conducted a comparative experiment among the methods to verify their effectiveness and practicality.