Travel time information service device based on fuzzy sets theory

Drivers on highways usually can obtain predicted travel time information through a traffic control system in Japan. Information processing for the proper description of the travel time is discussed. A device based on fuzzy set theory is considered to transform forecasted values into practical traffic information. Drivers perception concerned with an allowable gap between a real travel time and an informed travel time was observed in a survey. The type of fuzzy number is defined according to the traffic condition. Three methods are introduced to choose the proper description of the travel time from the database of acquired knowledge of drivers. The performance of the proposed device is evaluated to improve the data processing technique. Real data is used to find a satisfactory method to modify the device