In this paper, we evaluate the effectiveness of ITS safety merging support and collision prevention support services from the viewpoint of changes in driving behavior. By analyzing drivers' eye movement and pedal operation behavior measured by an eye mark recorder and wearable sensors respectively, we investigate the difference among driving behavior with and without providing ITS safety services. Through a demonstration experiment performed on Hanshin Expressway in 2009, we have found out that (1) ITS safety merging support service could encourage drivers to pay more careful attentions towards oncoming merging vehicles to fast lane and (2) ITS collision prevention support service could encourage drivers to keep safe time headway and to reduce distraction.
In conducting transportation planning for neighborhoods, many problems related to "the silent group" have occurred. This study focuses on social experiments as an effective tool that allow transportation plans work smoothly when the silent group exist. In order to analyse effect of social experiments on the silent group's consciousness, the authors conducted questionnaire surveys before and after a social experiment of traffic regulation changes, and conducted follow-up surveys after both the surveys. In conclusion, it was shown that the silent group and non-silent groups opinions about the traffic regulation changes were not different before the social experiment but after that the silent group more accept the traffic regulation changes than non-silent group. In addition it was suggested that the social experiment led objections that had not been elicited by a paper plan. These result suggests that social experiments work effectively for efficient transportation planning with existence of the silent group.
In recent years, evacuation behaviors with other people have attracted much attention. The purpose of this study has been modeling of process of the residents' cooperation behaviors. The modeling follows from the fitness model which deals with the processes of all residents' cooperation behaviors while taking the macroscopic approach. We develop the fitness model to clarify the cooperation behaviors under the typhoon disaster in the city of Niihama in 2004 by making an empirical analysis and validate the network formations and structures of the proposed model. The proposed model implies that the choices of the people to cooperate are affected by personal characters and the numbers of cooperation behaviors at that time.
In this research, the authors analyzed how a social experiment and its information provision affect silent group's consciousness about traffic safety project in a residential neighborhood. Conducting social experiments turns traffic management plans into reality in limited time, however, some residents including the silent group may not be aware of the experiments' impacts on their neighborhood because of their place of residence or life pattern. The authors tested the hypothesis that active provision of information about the effectiveness of a social experiment encourages the silent group to accept the experimented plan with a case study. The case study is a implementation of speed humps in a residential area in Bunkyo ward, Tokyo. In conclusion, it was suggested that information provision of the experiment contributes to both silent group and non silent group's acceptance of installing speed humps permanently.
Agglomeration and dispersion of urban population were studied in New Economic Geography, and agglomeration of two city economy and racetrack economy was revealed to be triggered by bifurcation. In this paper, agglomeration of a system of cities on a line segment was studied. Comparative static analysis with respect to transportation cost was conducted for the core-periphery model of Forslid & Ottaviano. As a result, agglomeration was shown to progress via spatial period doubling cascade, which is a typical agglomeration behavior of racetrack economy. The line segment economy and racetrack economy thus were shown to display similar behaviors.