Faculty Profiles - NAKAMURA, Hideki

Papers - NAKAMURA, Hideki

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Estimation of Roundabout Entry Capacity under Autonomous Vehicle Mixed Flows through a Traffic Simulator Reviewed

Gao, Y., Zhang, X., Kang, N. and Nakamura, H.

Proceedings for the 14th EASTS Conference 2021.9

Capacity Analysis of Signalized Traffic Circles in Comparison with Conventional Intersections Reviewed

Bai, Y., Zhang, X. and Nakamura, H.

Proceedings for the 14th EASTS Conference 2021.9

Lane-based Evaluation of the Traffic Flow Quality of Service in Urban Expressway Weaving Segments Based on Lane Utilization Rate Reviewed

Zhou, Z., Nakamura, H., Iryo-Asano, M. and Kakimoto, Y.

Proceedings for the 14th EASTS Conference 2021.9

Estimation Method of Left-turn Lane Capacity under the Influence of Pedestrians and Crosswalk Layout at Signalized Crosswalks Reviewed International journal

Emagnu, M. Y., Zhang, X., Iryo-Asano, M., and Nakamura, H.

Journal of Civil Engineering Vol. 36 ( 1 ) page： 32 - 40 2021.6

Estimation of Expected Pedestrian Presence Time at the Conflict Area of Signalized Crosswalks Reviewed

Emagnu, M.Y., Zhang, X., Iryo-Asano, M. and Nakamura, H.

Journal of JSCE D3 Vol. 76 ( 5 ) page： I_1485 - I_1495 2021.4

道路ネットワークの機能階層的利用に必要な道路・交通運用条件 Reviewed

関原敏裕・柿元祐史・中村英樹・井料美帆

土木学会論文集D3(特集号) Vol. 76 ( 5 ) page： I_1453 - I_1463 2021.4

道路ネットワークの機能的階層化のための道路の性能目標の設定手法に関する研究 Reviewed

柿元祐史・中村英樹

土木学会論文集D3(特集号) Vol. 76 ( 5 ) page： I_1235 - I_1243 2021.4

Empirical analysis of the effect of eliminating congestion due to right turn queues by shortening the cycle length at a major signalized intersection Reviewed

TATEMATSU Hideki, MORIMOTO Kiyoaki, TANAKA Atsushi, IZUMI Norihiro, NAKAMURA Hideki, SUZUKI Koji, IRYO Miho, KAKIMOTO Yuji

JSTE Journal of Traffic Engineering Vol. 7 ( 2 ) page： B_55 - B_61 2021.2

A demonstration experiment of the effect of shortening the signal cycle length on a suburban minor arterial street with signalized intersections

MAKINO Nobuhisa, KOBAYASHI Kei, IKEMIZU Takeharu, NAKAMURA Hideki, SUZUKI Koji, IRYO Miho, KAKIMOTO Yuji

JSTE Journal of Traffic Engineering Vol. 7 ( 2 ) page： B_6 - B_13 2021.2

信号交差点が連続する補助幹線道路における信号サイクル長短縮効果の実証実験 Reviewed

牧野修久・小林圭・池水丈明・中村英樹・鈴木弘司・井料美帆・柿元祐史

交通工学論文集(特集号) Vol. 7 ( 2 ) page： B_6 - B_13 2021.2

A Comparative Study on the Operational Performance between Signalized Turbo Roundabouts and Signalized Intersections Reviewed Open Access

Bai, Y., Zhang, X. and Nakamura, H.

Asian Transport Studies Vol. 7 2021.1

A Comparative Study on the Capacity of Signalized Turbo Roundabouts and Signalized Intersections Considering Various Geometric Layouts Reviewed

Bai, Y., Zhang, X. and Nakamura, H.

100th Annual Meeting of Transportation Research Board 2021.1

Estimation of Waiting Pedestrian Occupancy-time at Signalized Crosswalks for Turning Vehicle Maneuver Analysis Invited Reviewed

Emagnu, Y. M., Zhang, X., Iryo-asano, M. and Nakamura, H.

100th Annual Meeting of Transportation Research Board 2021.1

Roundabout Entry Capacity Estimation under the Condition of Autonomous Vehicle Mixed Traffic Flows Reviewed

Kang, N., Zhang, X. and Nakamura, H.

100th Annual Meeting of Transportation Research Board 2021.1

ESTIMATION OF EXPECTED PEDESTRIAN PRESENCE-TIME AT THE CONFLICT-AREA OF SIGNALIZED CROSSWALKS

EMAGNU Yonas M., ZHANG Xin, IRYO-ASANO Miho, NAKAMURA Hideki

Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management) Vol. 76 ( 5 ) page： I_1485 - I_1495 2021

Language：English Publisher：Japan Society of Civil Engineers

Crossing pedestrians is one of the critical factors in proper estimation of turning vehicle capacities at signalized intersections. Although individual pedestrian walking speeds and consequent pedestrian platoon maneuver are influenced by traffic signal settings, crosswalk length and bidirectional interactions of pedestrian flows, the existing capacity estimation methods of left-turning vehicles did not consider these impacts. This study aims to propose a method to estimate the expected pedestrian presence-time that pedestrian platoon occupies the conflict-area, considering the characteristics of pedestrian platoon maneuvers. Referring to the existing method to estimate time-dependent pedestrian presence probability distributions, this study re-estimated the parameters of the model using the additional database with higher pedestrian demand conditions. The model revealed that the increase of opposing pedestrian flow significantly reduces spatial variation. This model was applied to calculate expected pedestri

DOI： 10.2208/jscejipm.76.5_i_1485

CiNii Research

A STUDY ON A METHOD FOR DETERMINING PERFORMANCE TARGET OF MOBILITY FUNCTION FOR FORMING A FUNCTIONALLY HIERARCHICAL ROAD NETWORK

KAKIMOTO Yuji, NAKAMURA Hideki

Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management) Vol. 76 ( 5 ) page： I_1235 - I_1243 2021

Language：Japanese Publisher：Japan Society of Civil Engineers

Although the basic road network in Japan is almost completely constructed, a considerable portion of the roads is not functioning reasonably in terms of the expected mobility performance. The quality of service of the traffic flow is unsatisfactory, particularly on arterial highways due to access functions such as the presence of a number of signalized intersections and roadside access. In order to prevent such issues, it is necessary to clearly define the function of each road at the planning and design stage utilizing the concept of a functionally hierarchical road network. Therefore, the objective of this study is to present a method for setting performance targets necessary for each road level to form a functionally hierarchical road network, and clarify the gap between the current traffic conditions and those targets. Assuming one route using an arterial highway and another route using other local streets, the travel speed on each road type and the distance ratio of each route are evaluated. Based on this analysis, the network requirements for the arterial highway route are clarified in terms of the shortest travel time and lowest travel cost. In addition, the gaps between target travel speed and actual travel speed are analyzed using the aforementioned results as a performance target.

DOI： 10.2208/jscejipm.76.5_i_1235

CiNii Research

REQUIRED ROAD AND TRAFFIC OPERATION CONDITIONS FOR THE FUNCTIONALLY HIERARCHICAL USE OF ROAD NETWORKS

SEKIHARA Toshihiro, KAKIMOTO Yuji, NAKAMURA Hideki, IRYO Miho

Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management) Vol. 76 ( 5 ) page： I_1453 - I_1463 2021

Language：Japanese Publisher：Japan Society of Civil Engineers

The mobility functions on arterial roads have not been fully performed due to presence of roadside access and a number of signalized intersections in Japan. In order to solve this problem, it is necessary to realize a functionally hierarchical road network that promotes the division of functions of roads according to the length of trips by differentiation of road structures and traffic operations. In this study, hypothetical road networks with three road levels were assumed, for clarifying the impact of road and traffic operation conditions on the trip characteristic indices. Then, by using an index combining the trip characteristic indices of each level of roads, requirements of road and traffic operation conditions for the road network to be used hierarchically was investigated. As a result, the requirements were identified for example, the shorter the interchange spacing is, the greater the free speed differentiation between road levels are required.

DOI： 10.2208/jscejipm.76.5_i_1453

CiNii Research

The ESRA initiative: Towards global monitoring and analysis of road safety performance Open Access

Meesmann, U; Nakamura, H

IATSS RESEARCH Vol. 44 ( 3 ) page： 163 - 165 2020.10

Modeling of a novel risk index for evaluating the geometric designs of roundabouts

Yoshioka, K; Nakamura, H; Shimokawa, S; Morita, H

ACCIDENT ANALYSIS AND PREVENTION Vol. 145 page： 105702 2020.9

Language：English Publishing type：Research paper (scientific journal) Publisher：Accident Analysis and Prevention

In the geometric design of roundabouts, safety-oriented approaches are required rather than specification design ones that simply determine the dimensions of the geometric structural elements. We herein propose a risk index (RI) that combines the invisibility probability and the crash impact as a performance measure for evaluating the safety of the geometric designs of roundabouts, and we also describe a method for calculating this index. Invisibility probability represents the probability that an entering vehicle cannot view a vehicle coming from the upstream in a circulatory roadway and crash impact represents the amount of lost kinetic energy at the time of collision corresponds to the impact of the crash. A numerical simulation to model this RI on the basis of various geometric conditions is further presented. It is demonstrated that the invisibility probability is large when the entry angle is small and that the crash impact increases when the deviation angle decreases. The proposed approach is expected to help resolve issues with currently existing roundabouts and improve the design of future roundabouts to enhance their safety performance.

DOI： 10.1016/j.aap.2020.105702

Web of Science

Scopus

PubMed

Investigating the Efficiency and Safety of Signalized Intersections Under Mixed Flow Conditions of Autonomous and Human-Driven Vehicles Reviewed International coauthorship

Pan, A., Zhang, X., Nakamura, H. and Alhajyaseen, W.K.M.

Arabian Journal for Science and Engineering 2020.7

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Papers - NAKAMURA, Hideki