Study On The Transition Signal Of Signal Controlled Intersections In Cities

Traffic is very important to the economic development of a city, while with the expansion of the city and the growth of its population, also with the increase of private cars, traffic gradually become a restriction to the city's development. As a key port of the city's road net, intersection plays an important role in the city's traffic problem. ITS (intelligent transportation system) become an effective measure to solve the traffic problem. In the ITS, traffic signal light is the earliest and most common device. Now there are a lot of study to red light signal and green light signal, however, about the transition signal, such as yellow light signal and flashing green light signal, very little research was doing on it.This paper aims at doing an integrity research to the transition signal applying in the city's signal controlled intersections. After summing up the application actuality about the transition signal in and out of country, this text discussed the transition signal form many point of view, including its appearance, its time, its influence to drivers, how to make use of it and so on.In this paper, I have done much work to the yellow light signal. First, analyze the influence factors of the yellow light signal time lasting, establish an effective yellow light time computing model, and connected to the real traffic data, using simulating software VISSIM to make a contrast between different yellow light time computing model form the aspects of safety and efficiency. And then an instruction was made which is about the relationships between yellow light time and traffic efficiency, and between yellow light time and traffic safety. At last, the text put forward the idea of how to set a yellow light time with both efficiency and safety. Besides this, the paper also analyzed the influences of yellow light signal to drivers' driving actions. Contrasting the advantages and disadvantages when using a time count down device, this paper told that using ITS to help drivers making the choice of driving action, and then discussed the basic theory and working process of the driving decision-making assistance system for drivers.The paper also made a study on the transition signal to pedestrians at intersections.. The text mainly study on the transition's appearance and its time length. Through studying, found out the shortage of the old time computing model, then added the disturb influences of turning vehicles to the time for pedestrians to cross intersections, and finally, from the aspects of theory logic and data statistic built model to describe this influences.To the flashing yellow light signal and all red signal, this paper firstly made a summarize mainly about their functions, and then put forwards the conditions of setting flashing yellow light signal, establish the model for all red signal time computing.