| Project/Area Number |
02650369
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
交通工学・国土計画
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| Research Institution | University of Tokyo |
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Principal Investigator |
KOSHI Masaki Professor, Faculty of Engineering, University of Tokyo, 工学部, 教授 (70013109)
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| Co-Investigator(Kenkyū-buntansha) |
OZAKI haruo Research Assoc., Inst. of Industrial Sci., University of Tokyo, 生産技術研究所, 助手 (30204184)
AKAHANE Hirokazu Assoc. Professor, Faculty of Engineering, Chiba Institute of Technology, 助教授 (60184090)
KUWAHARA Masao Assoc. Professor, Inst. of Industrial Sci., University of Tokyo, 生産技術研究所, 助教授 (50183322)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1991: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1990: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Car-following theory / Highway capacity / Bottlenecks / Traffic congestion / Image processing / Highway alignment |
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| Research Abstract |
1. Vehicle traffic flow was observed at congestion-prone sag section, Hadano sag on Tomei Expressway, on July 28, 1990 and July 29, 1991.
(1)Traffic flow was video recorded by video cameras mounted on a balloon. Vehicles' movement was tracked by video image processing. Traffic volume and speed were also observed by video and vehicle detectors.
(2)It was found that congestion starts at sag section and the position of the head of congestion moves back and forth around spot which is regarded as the bottleneck.
2. A car-following experiment was implemented in the Tsukuba test course of a circuit of 6.1 kilometers. The speed and clearances were measured by test vehicles. It was suggested that lighting of stop lamp should be considered on car-following model.
3. new car-following models were proposed for two modes ; for free flow mode and for congested flow mode.
4. Drivers' transition of car-following behavior from free flow mode to congested flow mode seems to start when they join a queue and to be completed when they have been in the queue for a a little less than ten minutes. Bottleneck capacity becomes lower as the congestion queue grows longer.
5. Departure flow rate from a queue is higher in higher light level of the environment and is further higher when the light condition changes from darker to brighter level.
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