論文 - 中村　英樹

簡便な交通流観測ツールとしての画像処理へのニーズと実用課題

鈴木一史・中村英樹

交通工学   Vol.42, No.3 巻   頁： 20-27   2007年5月

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記述言語：日本語  

Characteristics of Breakdown Phenomena in Japan Urban Expressway Merging Sections

Shawky, M. and Nakamura, H

86th TRB Annual Meeting     頁： 10 pages, CD-ROM   2007年1月

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記述言語：英語  

Signalized Intersection Design and Operations: Experiences in Germany and Japan

Tang, K and Nakamura, H.

7th International Conference of Chinese Transportation Professionals   Shanghai 巻   2007年

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Characteristics of breakdown phenomenon in merging sections of urban expressways in Japan

Shawky, M; Nakamura, H

TRANSPORTATION RESEARCH RECORD   ( 2012 ) 頁： 11 - 19   2007年

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記述言語：日本語   出版者・発行元：Transportation Research Record  

This paper aims to investigate the breakdown phenomenon at on-ramp merging sections of urban expressways in Japan. The breakdown events are treated here as a probabilistic phenomenon. Six merging sections at which breakdowns frequently occur are selected to be different in their geometry in relation to acceleration lane length and ramp entrance side. Three different aspects of merging capacity are recognized: the maximum outflow rate before the breakdown, the outflow rate when the breakdown starts to occur, and the outflow rates during the queue discharge period. These outflow aspects are analyzed after they are converted into an equivalent passenger car unit to eliminate the effect of heavy vehicles. Then the probability of breakdown at these sections is investigated as a function of outflow rates. The observed breakdown probabilities follow the Weibull distribution function at all sections, with close values of shape parameter and wide range values of scale parameter. The values of the scale parameter are used to investigate the effects of the acceleration lane length and entrance ramp side. Moreover, the breakdown probability is investigated as a function of the occupancy observed immediately downstream of the merging section. Last, the effects of ramp flow ratio and interval length of aggregated data are discussed.

DOI： 10.3141/2012-02

Web of Science

Scopus

A Comparative Study on Traffic Characteristics and Driver Behavior at Signalized Intersections in Germany and Japan

Tang Keshuang, Nakamura Hideki

Proceedings of the Eastern Asia Society for Transportation Studies   2007 巻 ( 0 ) 頁： 324 - 324   2007年

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記述言語：英語   出版者・発行元：Eastern Asia Society for Transportation Studies  

The authors are currently investigating the applicability of the operation policy, commonly applied at signalized intersections in Germany, for Japanese signalized intersections. As an initial step, this study analyzed traffic characteristics and driver behavior at several typical German and Japanese intersections to understand the impacts of such policy on them. The results showed that German intersections had significantly lower starting response time (SRT) and start-up lost time (SULT), which was due to the sequence of signal indications. However, no apparent variations existed in saturation flow rate (SFR) and lost time in amber (LTA). Left turners at German intersections tended to be more aggressive in choosing suitable gaps, indicated by critical gap and 1/PET values. Moreover, longer all-red clearance interval and gap adaptive control seemed to encourage aggressive pass. Lower stop-line crossing during amber (SCA) and red light violation (RLV) rates at German intersections were attributed to multiple factors.

DOI： 10.11175/eastpro.2007.0.324.0

CiNii Research

REPRODUCING THE HOURLY TRAFFIC DEMAND FLUCTUATION THROUGHOUT A YEAR FOR THE EVALUATION OF HIGHWAY CROSS-SECTION DESIGN

NAKAMURA Hideki, UTSUMI Taisuke, WATANABE Masamitsu

Proceedings of the Eastern Asia Society for Transportation Studies   2007 巻 ( 0 ) 頁： 277 - 277   2007年

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記述言語：英語   出版者・発行元：Eastern Asia Society for Transportation Studies  

The authors have advocated a new planning and design methodology in for highways in Japan, which includes operational performance check in consideration of the traffic demand fluctuation. For this method, it is necessary to reproduce the hourly traffic demand fluctuation on a planned and designed highway section throughout a year. This study proposes a method to reproduce it with two phases; reproducing the daily traffic demand phase and setting the hourly traffic demand coefficient phase, in consideration of potential hourly traffic demand on a day with congestion. The reproduced hourly traffic demand fluctuation using this method was validated on two expressway sections in Japan. As a result, we could verify that the reproduction precision was satisfactory except that it could not consider some special local characteristics.

DOI： 10.11175/eastpro.2007.0.277.0

CiNii Research

PERFORMANCE EVALUATION OF ROUNDABOUTS CONSIDERING TRAFFIC CONFLICTS

NAKAMURA Hideki, MABUCHI Taiki

Journal of the Eastern Asia Society for Transportation Studies   7 巻 ( 0 ) 頁： 2412 - 2424   2007年

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記述言語：英語   出版者・発行元：Eastern Asia Society for Transportation Studies  

A roundabout is an alternative type of junction control that reduces delay under low traffic demand. Conditions under which they are advantageous in terms of capacity and delay have been already shown in existing researches. However, the implementation of roundabouts is likely to be negatively evaluated, particularly in Japan; due to safety reasons since traffic conflicts are inevitable when merging. In this paper, a methodology for the performance evaluation of at-grade junctions considering a trading-off relationship between delay and vehicular conflicts is proposed. The performance of signalized intersections and roundabouts are also compared by applying this methodology. As a result, it was found that roundabouts are still more advantageous than signalized intersections when approaching traffic volume is less than 500 vph, even though not only delay but also conflicts were taken into account as evaluation indices.

DOI： 10.11175/easts.7.2412

CiNii Research

PERFORMANCE EVALUATION OF HIGHWAY SEGMENTS USING TRAVEL TIME BASED PERFORMANCE MEASURES

Mehran Babak, Nakamura Hideki

Proceedings of the Eastern Asia Society for Transportation Studies   2007 巻 ( 0 ) 頁： 318 - 318   2007年

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記述言語：英語   出版者・発行元：Eastern Asia Society for Transportation Studies  

This paper introduces some applications of travel time based performance measures and mainly the travel time reliability as a measure of performance. In this research, operational conditions of two different segments of an intercity expressway are evaluated and compared by using travel time based performance measures. While Buffer Time Index and Travel Time Index are used to evaluate travel time reliability and congestion, it is observed that travel times are more reliable during off-peak periods, whereas unreliability dramatically increases during the peak periods. Additionally, travel time reliability varies from time to time according to demand fluctuations and traffic influencing events. Finally, highway segments are found to be more susceptible to disruptions caused by traffic influencing events once congestion starts to build up.

DOI： 10.11175/eastpro.2007.0.318.0

CiNii Research

INFLUENCE OF HEAVY VEHICLES ON JAPAN TWO-LANE HIGHWAY SPEED AND FOLLOWER FLOW CHARACTERISTICS

CATBAGAN Jerome, NAKAMURA Hideki

Journal of the Eastern Asia Society for Transportation Studies   7 巻 ( 0 ) 頁： 2533 - 2545   2007年

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記述言語：英語   出版者・発行元：Eastern Asia Society for Transportation Studies  

The effects of heavy vehicles become more pronounced in two-lane highway facilities with passing restrictions since vehicles in a platoon do not have any other choice but to follow the leaders’ choice of speed, which is usually below their desired speed levels. Furthermore, platoon lengths are expected to be longer than usual, affecting level of service indicators such as follower density and average travel speed. This study aims to make a preliminary analysis of the influence of heavy vehicle on such facility types in Japan. Detector data were analyzed for two different time periods — peak and weekday. The speed of heavy vehicles has a direct effect on follower speed and follower density was found to become more sensitive to heavy vehicle percentage as flow rate increases. Average speed was also found to be more sensitive to heavy vehicle presence on upgrades, especially during the evening period.

DOI： 10.11175/easts.7.2533

CiNii Research

Influence of Heavy Vehicles on Japan Two-Lane Highway Speed and Follower Flow Characteristics

Catbagan Jerome Lejano, Nakamura Hideki

Proceedings of the Eastern Asia Society for Transportation Studies   2007 巻 ( 0 ) 頁： 330 - 330   2007年

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記述言語：英語   出版者・発行元：Eastern Asia Society for Transportation Studies  

The effects of heavy vehicles become more pronounced in two-lane highway facilities with passing restrictions since vehicles in a platoon do not have any other choice but to follow the leaders' choice of speed, which is usually below their desired speed levels. Furthermore, platoon lengths are expected to be longer than usual, affecting level of service indicators such as follower density and average travel speed. This study aims to make a preliminary analysis of the influence of heavy vehicle on such facility types in Japan. Detector data were analyzed for two different time periods - peak and weekday. The speed of heavy vehicles has a direct effect on follower speed and follower density was found to become more sensitive to heavy vehicle percentage as flow rate increases. Average speed was also found to be more sensitive to heavy vehicle presence on upgrades, especially during the evening period.

DOI： 10.11175/eastpro.2007.0.330.0

CiNii Research

A COMPARATIVE STUDY ON TRAFFIC CHARACTERISTICS AND DRIVER BEHAVIOR AT SIGNALIZED INTERSECTIONS IN GERMANY AND JAPAN

TANG Keshuang, NAKAMURA Hideki

Journal of the Eastern Asia Society for Transportation Studies   7 巻 ( 0 ) 頁： 2470 - 2485   2007年

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記述言語：英語   出版者・発行元：Eastern Asia Society for Transportation Studies  

The authors are currently investigating the applicability of the operation policy, commonly applied at signalized intersections in Germany, for Japanese signalized intersections. As an initial step, this study analyzed traffic characteristics and driver behavior at several typical German and Japanese intersections to understand the impacts of such policy on them. The results showed that German intersections had significantly lower starting response time (SRT) and start-up lost time (SULT), which was due to the sequence of signal indications. However, no apparent variations existed in saturation flow rate (SFR) and lost time in amber (LTA). Left turners at German intersections tended to be more aggressive in choosing suitable gaps, indicated by critical gap and 1/PET values. Moreover, longer all-red clearance interval and gap adaptive control seemed to encourage aggressive pass. Lower stop-line crossing during amber (SCA) and red light violation (RLV) rates at German intersections were attributed to multiple factors.

DOI： 10.11175/easts.7.2470

CiNii Research

性能照査型道路計画設計のための年間を通じた時間交通需要変動推計手法の構築

内海 泰輔, 中村 英樹, 渡辺 将光

土木計画学研究・論文集   24 巻 ( 24 ) 頁： 825 - 834   2007年

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出版者・発行元：公益社団法人 土木学会  

筆者らは, 性能照査型道路計画設計手法の導入を提案しているが, 計画/設計道路の性能をより的確に評価するためには, 年間8,760時間の時系列的な時間交通需要変動を考慮することが必要である. そこで本論文では, 日ベースと時間ベースの2段階に分け年間の時間交通需要変動を推計する手法を構築した. これにより車両感知器では直接観測することが困難な超過需要を考慮することができる. そして, この手法を用いて道路カテゴリ別の平均的な時間交通需要変動を推計した. これと各種条件・道路構造別の道路交通性能を組み合わせれば, 計画/設計道路で実現される交通状況を年間を通じて想定することができ, 道路の性能をより詳細に評価することが可能となる.

DOI： 10.2208/journalip.24.825

CiNii Research

Effects of Heavy Vehicles on Following Behavior in Two-Lane Highway Sections

Catbagan, J., Nakamura, H. and Utsumi, T

  No.34 巻   頁： 4ページ，CD-ROM   2006年12月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

On-Ramp Merging Capacity in Japan Urban Expressways: A Stochastic Approach

Shawky, M. and Nakamura, H.

  No.34 巻   頁： 4ページ，CD-ROM   2006年12月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

ラウンドアバウトの幾何構造と性能に関する検討

馬渕太樹・中村英樹

土木計画学研究・講演集   No.34 巻   頁： 4ページ，CD-ROM   2006年12月

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

ランドアクセスからみた道路のサービス水準の定量化に関する研究

斉藤裕子・中村英樹・内海泰輔・馬渕太樹

土木計画学研究・講演集   No.34 巻   頁： 4ページ，CD-ROM   2006年12月

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

Evaluation of Performance Measures for Two-Lane Expressways in Japan, Transportation Research Record 査読有り

Catbagan, L.J. and Nakamura, H.

Transportation Research Board     頁： 111-118   2006年12月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

年間を通じた時間交通需要変動の再現手法の構築

渡辺将光・中村英樹・内海泰輔

土木計画学研究・講演集   No.34 巻   頁： 4ページ，CD-ROM   2006年12月

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

路上駐車を考慮した街路構造

中村英樹・中井麻衣子

交通工学   Vol.41, No.6 巻   頁： 40-44   2006年11月

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担当区分：筆頭著者   記述言語：日本語  

TrafficAnalyzer - The Integrated Video Image Processing System for Traffic Flow Analysis

Suzuki, K. and Nakamura, H.

13th World Congress on Intelligent Transportation Systems     頁： 8 pages in CD-ROM   2006年10月

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記述言語：英語