Haruki KITAGAWA
Study about signal control parameter in analysis of vehicle behavior in winter at snowing region
Kazushi SANO , Hiroaki NISHIUCHI
In snow cold season is long areas such as Niigata prefecture, snow has a significant impact on traffic flow. Thus, since in the summer and winter different car behavior is large, there is a need for time in the combined signal control. However, factors that season and regional characteristics brings to road traffic is not included in enough to guidelines at the time of signal design. This is because the Winter road traffic in reality is not clear. Therefore, at present, are designed to control signals from the summer traffic conditions throughout the year.
The snow road surface, the friction coefficient of the tire and the road surface is reduced braking distance increases greatly, the driver is switched to the operation that is a margin in order to avoid slip. In order to quantitatively grasp the car behavior winter, and to compare the traffic conditions of the summer and winter from various studies based on the intersection video. Surveyed point is a Atago intersection of Nagaoka. In the measurement, I was subjected to analysis from the speed and headway time of a running vehicle. When calculating the saturation flow rate, the summer has caused a large difference, and understand the importance of winter dedicated signal control. Also, when compared by the direction in traffic, winter since the right is reduced compared to the straight-left, was also analyzed the behavior of the right vehicle. From the above analysis, to understand the behavior of the automobile winter, to prepare a foundation upon future signal control design.
Then, from the simulation model simulates the behavior of the automobile winter was evaluated congestion mitigation measures when supersaturated with the signal control. And signal control are the three points of the cycle length split offset. The design of the winter dedicated signal control, it was possible to suggest the possibility of alleviating the delay of snow road.
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