著者

織田 利彦

雑誌

研究報告高度交通システムとスマートコミュニティ(ITS) (ISSN:21888965)

巻号頁・発行日

vol.2019-ITS-78, no.8, pp.1-6, 2019-08-30

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Recently owing to fiscal constraints, installation of traffic control systems and equipment has been reduced. In addition, the renewal and repair of the infirastruct has been delayed remarkably. These situations have led to decrepit infrastructure. Ahove all, the operations of vehicle detectors monitoring traffic flows have degraded and failed to function property. VICS (Vehicle Information & Communication System) Center has provided drivers with useful traffic information, and travel time service has offered excellent assistance in route choice decision. However, the degraded detectors has resulted in missing traffic flow data and lowered the quality of the service. Moreover, unusual traffic flows caused by large scale and special events such as annual functions have often occurred, and heavy congestion can be expected on the srurounding roads of events site. This paper describes a study on travel time estimation for urban roadways with missing detector data in extraordinary traffic flows by using an ensemble learning algorithm. In order to verify the effectiveness of the approach, we conducted an experimental study on arterial roads around Nakayama Racecourse on the days of the horse racing, and found that our approach has the potential to estimate the missing travel time data and enable the prediction of traffic flow to enhance the information service.

著者

織田 利彦

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.125, no.8, pp.800-807, 2005 (Released:2005-11-01)

参考文献数

7

被引用文献数

1 1

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In traditional coordinated traffic signal control on an urban road network, the following two problems have been known. First, the conventional method involves a time lag between traffic measurement and signal control. Second, an abrupt switching of control parameters throws the traffic flow into disorder.This paper proposes a new approach to avoid these problems. We increase the frequency of switching. The control parameters are switched as frequent as every two cycles. At the time of switching, minor variations of the on-going plan are generated. For each variation of plan, traffic delay at each intersection is predicted based on measured traffic data at up-stream detectors. Then the plan minimizing the delay is chosen to be the control parameters in the next cycle. In order to evaluate the validity of this approach, experiments were carried out using a traffic simulator. The experiments indicate that the proposed method reduces the queue length significantly, compared with the conventional method.

著者

織田 利彦 音喜多 亨 津久家 智光 橋場 加奈

出版者

一般社団法人 システム制御情報学会

雑誌

システム制御情報学会論文誌 (ISSN:13425668)

巻号頁・発行日

vol.11, no.8, pp.466-476, 1998-08-15 (Released:2011-10-13)

参考文献数

20

被引用文献数

1 2

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For the purpose of implementing the coordinated traffic signal control, urban road networks in Japan are divided into several sub-areas. Each sub-area consists of a series of signal intersections. The traffic signal timing is optimized within each sub-area and reflects the local traffic situation. Since there is no well-established method of decomposing a traffic network into sub-areas, the decomposition is determined by skillful engineers based on their experience. This paper proposes a new method of decomposition, which is based on an effectiveness index reflecting the traffic delay and the topological structure of the sub-area network. To evaluate the performance of our approach, simulation experiments are carried out for an actual road network. The results show that the decomposition obtained by our method outperforms the conventional decomposition in terms of the employed performance index.