The Research On Effective Setting Of Freeway Speed Limit Signs

This paper relies on the scientific construction project of western transportation, "The research on the recognition and setting effectively of road traffic signs", studies the effective setting of freeway speed limited signs. Using the theory of psychology and ergonomics, this paper analysis the drivers' information processing of traffic sign and man-machine driver system. Based on these theory researches, we conclude that the effective setting of freeway speed limit sign should consider the various influence factors such as road environment, traffic flow and so on. Besides rely on a great of questionnaires and surveys of SanFu freeway, the paper discusses the value of speed limit, and bring forwards three effect ways of effective setting of this signs. Moreover, based on the analysis of the key driving behavior shaping factors, this paper constructs the speed choosing model under the influence of speed limit signs and car-following model, which based on psychology analysis of drivers, and certain the parameters of these models. These results will provide some knowledge to the further research on speed limit signs.The safety of road traffic in our country is not very optimistic now, and accident rates increased year after year. Speed limit signs, one of the effect ways to freeway speed control, play an important role in the safety establishment of road traffic. So the researches of drivers' psychology and behavior at the freeway limit signs have significance senses. The speed limit signs express speed information to drivers, so the research of value of speed and limit methods which based on the analysis of driver behavior is better to improve the effective of this sign. Now in domestic, we have no systemic regulations on the values, It's unreasonable of the freeway limit speed all base on the design speed, design speed and limit speed have different definitions and applying areas. So a lot of limit speeds in the freeway are not accord with actual road circumstance, and drivers all consider that design speed is unacceptable.Based on the thought above, we use several chapters in this paper to describe these techniques in details and we will introduce its main contents respectively now.In chapter two, the theory of psychology and ergonomics were used in the research of driver information processing, and the driver's traffic sign information processing model was built up, and the course of traffic sign recognizing was also analyzed based on the model .It draws a conclusion that the many influence factors should be considered on limit sign setting.In chapter three and four, relies on a great of questionnaires and surveys of SanFu freeway, including the component of traffic flow, the vehicle's real speed, the accordance between design speed and the vehicle's real speed. Based on the data above, we discuss the limit speed value and projects, we put forward three limit ways in this paper.In chapter five and six, using the factor analytic method to certain the main factors which affect the drivers to distinguish the speed limit signs, in this foundation determined the driver behavior pattern, and constructs the speed choosing model under the influence of speed limit signs and car-following model.In chapter sever, this paper advances the principle and frame of speed control, and introduces many assistant establishments of speed limit sign, which have reference to the optimal of freeway speed limit sign setting.Conclude the researches, we have several innovative point:(1) Using the theory of psychology and ergonomics, the driver's traffic sign information processing model and drivers behavior model were built up in this paper.(2) Based on the data analysis of the component of traffic flow, the vehicle's real speed, the accordance between design speed and the vehicle's real speed, the paper certain the way of limit speed that is speed limit road segment and value of limit should rely on the vehicle's real speed, and three limit ways were provided in this paper.(3) The speed choosing model under the influence of speed limit signs and car-following model were constructed. These models will provide some knowledge to the further research on speed limit signs.