Faculty Profiles - NAKAMURA, Hideki

Papers - NAKAMURA, Hideki

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往復2車線道路における付加追越車線の設置水準に関する研究

小林正人・中村英樹

土木計画学研究・講演集 Vol. No.39 page： 4ページ，CD-ROM 2009.6

信号交差点における幾何構造と進入条件を考慮した右折走行軌跡のモデル化

鈴木一史・中村英樹・石黒公規

土木計画学研究・講演集 Vol. No.39 page： 4ページ，CD-ROM 2009.6

日本におけるラウンドアバウトの交通容量と遅れの推定方法に関する考察

吉岡慶祐・中村英樹

土木計画学研究・講演集 Vol. No.39 page： 4ページ，CD-ROM 2009.6

階層型道路ネットワークへの再編に向けて

下川澄雄・内海泰輔・中村英樹・大口　敬

土木計画学研究・講演集 Vol. No.39 page： 4ページ，CD-ROM 2009.6

Effects of Bi-directional Flow and Different Pedestrian Age-Groups on Capacity of Signalized Crosswalks

Alhajyaseen, K.M.W. and Nakamura, H.

Vol. No.39 page： 4ページ，CD-ROM 2009.6

Assessing Impacts of Hard Shoulder Utilization on Travel Time Reliability and Safety

Mehran, B. and Nakamura, H

Vol. No.39 page： 4ページ，CD-ROM 2009.6

Assessing Impacts of Congestion Relief Schemes on Expressway Traffic Operations through Travel Time Reliability Analysis

Mehran, B. and Nakamura, H.

TRB 2nd international Symposium on Freeway and Tollway Operations page： 12 pages 2009.6

平面交差点の設計・運用方針の再考，巻頭言

中村英樹

交通工学 Vol. Vol.44, No.3 page： 1-2 2009.5

日本におけるラウンドアバウトの計画・設計ガイドの検討

中村英樹・大口　敬・馬渕太樹・吉岡慶祐

交通工学 Vol. Vol.44 ( No.3 ) page： 24-33 2009.5

*複数ボトルネックを含む高速道路区間における渋滞現象の確率的解析 Reviewed

稲野　晃・中村英樹・内海泰輔

高速道路と自動車 Vol. 第52巻 ( 第1号 ) page： 19-29 2009.1

A Probabilistic Approach to Evaluate Safety during Intergreen Intervals at Signalized Intersections

Tang, K. and Nakamura, H.

88th TRB Annual Meeting page： 24 pages, DVD-ROM 2009.1

Catbagan, J. L. and Nakamura, H. Reviewed

*Probability-Based Follower Identification in Two-Lane Highways

88th TRB Annual Meeting page： 15 pages, DVD-ROM 2009.1

A Methodology for Modeling Pedestrian Platoon Discharge and Crossing Times at Signalized Crosswalks

Alhajyaseen, W. K. M. and Nakamura, H.

88th TRB Annual Meeting page： 18 pages, DVD-ROM 2009.1

Methodology for Assessing Impacts of Congestion Relief Schemes on Travel Time Reliability

Mehran, B. and Nakamura, H.

88th TRB Annual Meeting page： 18 pages, DVD-ROM 2009.1

*Desired Speed Distributions on Two-Lane Highways under Various Conditions Reviewed

Catbagan, J. L. and Nakamura, H.

, Transportation Research Record , Traffic Flow Theory and Characteristics, Transportation Research Board Vol. No. 2088 page： 218-226 2009.1

Safety Evaluation for Intergreen Intervals at Signalized Intersections Based an Probabilistic Method

Tang, KS; Nakamura, H

TRANSPORTATION RESEARCH RECORD ( 2128 ) page： 226 - 235 2009

Language：Japanese Publisher：Transportation Research Record

This study presents a probabilistic safety estimation approach based on traffic conflict technique. The study aims to investigate the impacts of the German signal control policy and intergreen design method on safety during intergreen intervals at signalized intersections in Japan. To facilitate application of the policy, the uncertainty of input variables and of safety itself, indicated by the postencroachment time, was analyzed first by means of field data collected at 12 typical intersections in Japan and Germany. A few case studies were then examined with Monte Carlo simulation. The results indicated that safety during the intergreen interval and its reliability might significantly drop if intergreen times were simply changed from the values based on the Japanese method to the values based on the German method without supplementary countermeasures. However, safety as well as reliability can be maintained if the Japanese control policy is completely replaced with the German one.

DOI： 10.3141/2128-23

Web of Science

Scopus

Implementing Travel Time Reliability for Evaluation of Congestion Relief Schemes on Expressways

Mehran, B; Nakamura, H

TRANSPORTATION RESEARCH RECORD ( 2124 ) page： 137 - 147 2009

Language：Japanese Publisher：Transportation Research Record

Preevaluation of the impacts of congestion relief schemes on travel time reliability is significant for road authorities. However, most existing approaches to estimating travel time reliability rely mainly on empirical data and are therefore not of help for evaluating improvement schemes before implementation. A methodology is presented to estimate travel time reliability on the basis of modeling travel time variations as a function of demand, capacity, weather conditions, and road accidents. For a subject expressway segment, patterns of demand and capacity were generated for each 5-min interval during a year by using the Monte Carlo simulation technique, and accidents were generated randomly according to traffic conditions. A whole year analysis was performed by comparing demand and available capacity for each scenario; shock wave analysis was used to estimate the queue length at each time interval. Travel times were estimated from refined speed-flow relationships. The buffer time index was estimated as a measure of travel time reliability and compared with observed values from empirical data. After validation, the methodology was applied to assess the impact on travel time reliability of opening the hard shoulder to traffic. Opening the hard shoulder to traffic during the peak periods was found to ameliorate travel time reliability significantly and mitigate congestion levels, which could result in up to a 26% cut in the number of accidents occurring.

DOI： 10.3141/2124-13

Web of Science

Scopus

日本におけるラウンドアバウトの計画・設計ガイドの検討 Reviewed

中村英樹, 大口敬

交通工学 44(3) page： 24 - 33 2009

An Improved Follower Recognition Procedure to Estimate Follower Flow-Based Quality of Service Measures

Catbagan Jerome Lejano, Nakamura Hideki

Proceedings of the Eastern Asia Society for Transportation Studies Vol. 2009 ( 0 ) page： 338 - 338 2009

Language：English Publisher：Eastern Asia Society for Transportation Studies

Current follower recognition methodologies are based on single critical headway values that may not accurately identify followers since they do not take into account the randomness of preferred tracking headways and drivers desired speeds. This paper presents an improved, probability-based follower identification methodology that takes both of these factors into account while also considering their variability across different driving conditions. The calculated follower percentage and follower density values were compared with those estimated using the 3-second threshold suggested by the HCM. The proposed methodology estimated more followers, particularly during periods of heavy flow, highlighting the inability of using a single headway value to correctly identify followers. The resulting follower counts have been normalized, making it possible to theoretically identify followers at any given time or driving condition.

DOI： 10.11175/eastpro.2009.0.338.0

CiNii Research

Evaluation of field experiment of group-based signal control in Japan

Tang K., Nakamura H.

16th ITS World Congress 2009

Publisher：16th ITS World Congress

This paper presents the evaluation results on operational and safety performance of group-based signal control, based on a field test undertaken in Japan recently. Starting response time (SRT), start-up lost time (SULT), clearance lost time (CLT), saturation flow rate (SFR), and approach delay (AD) are selected to represent operational performance. Certain occurrence frequencies and rates of stop-line crossing during amber (SCA) and red-light-running (RLR) act as the measures to safety performance during intergreen intervals. The results from the before-and-after analyses supported that the group-based control itself generally didn't significantly affect SRT, SULT, CLT, and SFR, while remarkably improved AD. Meanwhile, it substantially decreased SCA and RLR at the exclusive through and right-turn lanes. It reveals that both operational and safety benefits might be expected by applying such a policy.

Scopus

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Papers - NAKAMURA, Hideki