The countdown display device is the countdown counter installed on the signalized intersection. In Taiwan, countdown display devices have installed on test sites during the past few years. The main purpose of the countdown display device is to provide drivers more information during signal changing internal and therefore support drivers' decision making. The types of countdown displays include: red-light countdown, green-light countdown, and red-and-green-light countdown. Through the questionnaire surrey, about 300 drivers in Kaohsiung City were investigated to explore their perception and preference upon the service and outlet of countdown displays. The result reveals that most of the respondents consider the countdown display device useful and a uniform layout of the device is preferred.