Effects of Time Headway and Velocity on Drivers' Trust in the HMI of ACC System - a Simulator-Based Study.

Adaptive Cruise Control (ACC) system has been gradually accepted and popularized in the market. Rational trust level in the system Human Machine Interface(HMI) facilitates the drivers to use ACC in a safe and appropriate manner. In this paper, we tested participants’ trust in the HMI of ACC system in cut-in conditions in a simulator, and aimed to investigate factors affecting the trust level. 24 participants joined in the simulator experiment in which the videos recorded in real-world driving were played as scenarios. Experimental results show that both driving velocity and time headway (THW) between vehicles affect the trust of ACC system HMI significantly. Drivers’ trust level increases with the increase of THW at certain velocity condition, and drivers’ trust level also increases with the increase of velocity at certain THW condition. Future research will focus on the HMI design of ACC with multiple modality of information output and validate the results in a varied driving environment.