Faculty Profiles - NAKAMURA, Hideki

Papers - NAKAMURA, Hideki

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A comparative study on the operational performance of four-leg intersections by control type

Arshi Abubeker N., Alhajyaseen Wael K. M., Nakamura Hideki, Zhang Xin

TRANSPORTATION RESEARCH PART A-POLICY AND PRACTICE Vol. 118 page： 52 - 67 2018.12

Editors' notes: Special issue on innovative intersection design and control for serving multimodal transport users

Tian Zong, Nakamura Hideki, Boltze Manfred, Chung Edward

TRANSPORTATION RESEARCH PART C-EMERGING TECHNOLOGIES Vol. 86 page： 639 - 640 2018.1

A Study on the Impact of AV-HDV Mixed Traffic on Flow Dynamics of Single-Lane Motorway

Kakimoto Yuji, Iryo-Asano Miho, Orhan Emre, Nakamura Hideki

INTERNATIONAL SYMPOSIUM OF TRANSPORT SIMULATION (ISTS'18) AND THE INTERNATIONAL WORKSHOP ON TRAFFIC DATA COLLECTION AND ITS STANDARDIZATION (IWTDCS'18) - EMERGING TRANSPORT TECHNOLOGIES FOR NEXT GENERATION MOBILITY Vol. 34 page： 219 - 226 2018

A Study on the Average Travel Speed on Interrupted Flow Multi-Lane Highways

Akandwanaho Edwin, Iryo Miho, Nakamura Hideki

A Lane-Based Analysis of Stochastic Breakdown Phenomena on an Urban Expressway Section

GOTO Azusa, KATO Daichi, NAKAMURA Hideki

Asian Transport Studies Vol. 5 ( 1 ) page： 64 - 80 2018

Language：English Publisher：Eastern Asia Society for Transportation Studies

In this study, stochastic breakdown phenomena on a two-lane section of a Japanese urban expressway are analyzed and modeled. Because the bottleneck of the subject section is supposed to be a complex geometry with an on-ramp, a horizontal curve and an uphill, analysis is conducted not only by cross section but also by lane to understand the characteristics of breakdowns in detail. For such a detailed analysis, applicability and limitation of the detector data with different aggregation intervals are also considered. Through the analysis, it is found that about 40% of breakdowns in the section occur first on the shoulder lane; one of the causes would be higher merging traffic volume. The estimation of breakdown probability shows that the capacity of the median lane is about 300-veh/h greater than that of the shoulder lane. Furthermore, it is found that the discharge flow rate deteriorates as the elapsed time after breakdown increases, especially at the beginning of congestion.

DOI： 10.11175/eastsats.5.64

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An Analysis on Impact of Roundabout Geometric Elements on Driving Behavior Reviewed

YOSHIOKA Keisuke, NAKAMURA Hideki, SHIMOKAWA Sumio, MORITA Hirohisa

JSTE Journal of Traffic Engineering Vol. 4 ( 1 ) page： A_47 - A_54 2018

Language：Japanese Publisher：Japan Society of Traffic Engineers

<p>For the safety performance and smooth operation of roundabouts, designing geometric elements that can realize appropriate driving behavior is an important issue, particularly regarding the S-shaped trajectory which is different from ordinary cross intersections. However in Japan, this kind of driving behavior characteristics on roundabouts has not yet been studied enough. In this study, video surveys for driving behavior by using an UAV were carried out at seven roundabouts with different geometric design and the impact of geometric design elements on driving behavior are analyzed. As a result, the entry corner radius and the turning angle which is formed by entry and exit legs are shown as critical factors for the lateral acceleration applied to the vehicle. Moreover, it is shown that oversized entry corner radius and turning angle smaller than 150 degrees could lead to lower lateral acceleration and result in lower speed control effect on straight through vehicles.</p>

DOI： 10.14954/jste.4.1_a_47

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Evaluation of the Unsignalized Two-stage Crossing on Basic Road Sections

ISHIYAMA Ryota, GOTO Azusa, NAKAMURA Hideki

JSTE Journal of Traffic Engineering Vol. 4 ( 1 ) page： A_8 - A_16 2018

Language：Japanese Publisher：Japan Society of Traffic Engineers

<p>In Japan's unsignalized crosswalks on basic road sections, it is hard to say that safety and efficiency of crossing pedestrians are sufficiently ensured. On the other hand, in recent years, attention has been paid to a "two-stage crossing", that is a method in which a crosswalk is split into two stages by using a median island. However, as application examples are still limited in Japan, it is necessary to quantitatively show its effect. In this study, stop-or-go decisions of pedestrians at crosswalks were analyzed considering the impacts of pedestrian crossing time as well as position and speed of approaching vehicles by using observed data. Based on that, the change of the critical gap at the time of applying the two-stage crossing was estimated by formulating a pedestrian gap acceptance model. In addition, the effect of improving efficiency was quantitatively evaluated, by calculating the average delay of crossing pedestrians using this critical gap.</p>

DOI： 10.14954/jste.4.1_a_8

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A STUDY ON STOCHASTIC BREAKDOWN PHENOMENA IN INTERCITY EXPRESSWAY LANE DROP SECTIONS

KATO Daichi, KAKIMOTO Yuji, NAKAMURA Hideki, GOTO Azusa

Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management) Vol. 74 ( 5 ) page： I_1411 - I_1418 2018

Language：Japanese Publisher：Japan Society of Civil Engineers

Recently, a lot of knowledge has been accumulated about breakdown phenomena on expressways, their occurrence mechanisms, stochastic nature, and the differences in the pre- and post-breakdown capacities. However, in sections where lane use characteristics have a large effect – such as in lane drop sections, although capacity reduction is known to occur, there are still many unclear points, and more detailed analysis is necessary. Therefore, in this paper, we analyzed the mechanism before and after breakdown in several sections with different usage of the narrowing lane. Breakdown probability curves were estimated based on lane use characteristics, and it was found that the breakdown probability was highest in merging lanes, followed by passing lanes, and was lowest in lane one. This is because in lane one there is little variation in lane usage before breakdown, and left-side overtaking occurs in the merging lane, showing that the influence of lane use characteristics is large.

DOI： 10.2208/jscejipm.74.i_1411

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APPLICABILITY OF SAFETY PERFORMANCE EVALUATION METHOD FOR ROUNDABOUTS TO JAPAN

YOSHIOKA Keisuke, NAKAMURA Hideki, SHIMOKAWA Sumio, MORITA Hirohisa

Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management) Vol. 74 ( 5 ) page： I_1037 - I_1046 2018

Language：Japanese Publisher：Japan Society of Civil Engineers

Since the revision of the Road Traffic Law in 2014, roundabouts have been implemented and planned throughout Japan, and further spread is expected in the future. The geometric design of roundabout is a process of determining combinations of various geometric elements, and it is indispensable to evaluate safety performance for the entire geometry in this process. However, in Japan, concrete methods and indicators for evaluating safety performance have not been considered. Therefore, in this research, overseas design guidelines have reviewed the policies or features of performance evaluation based on “Fastest Path” and “Deflection Angle”. Furthermore, the geometric design of existing roundabouts was evaluated and the applicability to Japan was discussed.

DOI： 10.2208/jscejipm.74.i_1037

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A ROUNDABOUT ENTRY CAPACITY ESTIMATION MODEL CONSIDERING THE IMPACT OF GEOMETRIC ELEMENTS

KANBE Nobuto, ZHANG Xin, NAKAMURA Hideki, ODAKA Shinji

Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management) Vol. 74 ( 5 ) page： I_1399 - I_1409 2018

Language：Japanese Publisher：Japan Society of Civil Engineers

Entry capacity of roundabouts should be confirmed when considering their introduction. However, since there are still few roundabouts in Japan, the impact of roundabout geometry on entry capacity is still unclear. In addition, although the roundabout entry capacity in Japan is calculated based on the gap acceptance theory, the impact of roundabout geometry on the necessary gap parameters has not been clarified. Therefore, in this study the impact of roundabout geometry on entry capacity of roundabouts was analyzed using empirical data from Japan, and an estimation model of the gap parameters using geometry and traffic conditions as explanatory variables was proposed. Based on this, the influence of roundabout geometry on entry capacity was quantitatively clarified.

DOI： 10.2208/jscejipm.74.i_1399

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Assessing Safety of Signalized Intersections Influence of Geometric Attributes and Regionality on Traffic Accident Risk

Shiomi Yasuhiro, Watanabe Kazuki, Nakamura Hideki, Akahane Hirokazu

TRANSPORTATION RESEARCH RECORD Vol. 2659 ( 2659 ) page： 71 - 79 2017.1

An Analysis of Characteristics of Heavy Vehicle Behavior at Roundabouts in Japan

Kang Nan, Nakamura Hideki

WORLD CONFERENCE ON TRANSPORT RESEARCH - WCTR 2016 Vol. 25 page： 1485 - 1493 2017

A study on appropriate road spacing for the functionally hierarchical network planning

Goto Azusa, Nakamura Hideki

WORLD CONFERENCE ON TRANSPORT RESEARCH - WCTR 2016 Vol. 25 page： 3821 - 3829 2017

Modelling Travel Speed along Japanese Highways/Streets for Planning Stage Application

AKANDWANAHO Edwin, GOTO Azusa, NAKAMURA Hideki

Journal of the Eastern Asia Society for Transportation Studies Vol. 12 ( 0 ) page： 1604 - 1618 2017

Language：English Publisher：Eastern Asia Society for Transportation Studies

Accurate estimation of travel speed along a transport facility is necessary in order to ensure that the facilities meet the required performance. In this paper, the performance of the Highway Capacity Manual travel speed model is checked for Japanese roads. Then, a travel speed estimation model is developed from data collected along a road section in Hamamatsu City, Japan. The model provides an estimate of the average travel speed along a road section by inputting demand flow rates, section length, number of signalised intersections, signalised intersection density, and the number of access points along the road in the travel direction. It is found that the travel speed slightly increases with increased section length, and decreases with increased access points and higher number and density of signalised intersections.

DOI： 10.11175/easts.12.1604

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A STUDY ON ESTIMATION PROCEDURE OF CRITICAL GAPS AT ROUNDABOUTS

GOTO Azusa, NAKAMURA Hideki

Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management) Vol. 73 ( 5 ) page： I_1243 - I_1250 2017

Language：Japanese Publisher：Japan Society of Civil Engineers

Critical gap is an important parameter for not only entry capacity estimation but also safety evaluation at roundabouts. This paper gives an overview on the existing procedures for estimating critical gaps and compares them by applying into an empirical data observed at a roundabout in Japan. Application of other procedures than Raff's method, which has been commonly used in Japan, enables to estimate not only a single representative value of critical gaps (e.g., mean or median) but also their distribution. Through a comparison, differences of the estimated critical gap distributions are presented and discussed considering the limitation in the observed samples.

DOI： 10.2208/jscejipm.73.i_1243

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Analytical Study on the Relationship between Level of Pedestrian-vehicle Separation and Performance of Signalized Intersections

ZHANG Xin, NAKAMURA Hideki

JSTE Journal of Traffic Engineering Vol. 3 ( 5 ) page： 11 - 20 2017

Language：Japanese Publisher：Japan Society of Traffic Engineers

One of the measures to inhibit conflicts between pedestrian and left-turning vehicle at crosswalk of signalized intersections is, to provide separate phases for pedestrian and turning vehicle, such as exclusive pedestrian phase or Leading Pedestrian Interval (LPI). LPI is the phase which pedestrian green is displayed a few seconds ahead of vehicle green phase, and in this preceding time interval, a part of pedestrians can be protected from the conflicting left-turning vehicles. From the viewpoint of safety and mobility performance, LPI can be positioned between the conventional four-phase type in which the concurrent pedestrians and vehicles share the same signal phase and the exclusive pedestrian phase type. However, the safety and mobility performance of these three types of signal phasing is unclear. Thus, this study investigates and compares delays of pedestrian and vehicle, degree of saturation, capacity and pedestrian exposure time under those three types of signal phase types. Then an application range of LPI and the boundary condition of exclusive pedestrian phase are discussed.

DOI： 10.14954/jste.3.5_11

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ラウンドアバウト幾何構造設計の安全性評価指標に関する検討

中村英樹

土木計画学研究・講演集 Vol. 55 2017

幾何構造要因を考慮したラウンドアバウト流入交通容量のモデル化

中村英樹

土木計画学研究・講演集 Vol. 55 2017

Impact of Inside Intersection Pavement Markings to Mobility Performance at Urban Signalized Intersections in Japan and the Philippines

VILLEGAS John Jowhell, GOTO Azusa, NAKAMURA Hideki

Journal of the Eastern Asia Society for Transportation Studies Vol. 12 ( 0 ) page： 1637 - 1650 2017

Language：English Publisher：Eastern Asia Society for Transportation Studies

Inside intersection pavement markings category in Japan and Philippines are different, and the difference of its impact to mobility performance are still unknown. Left-turn lanes (right-turn in Japan) is one of key movements in urban signalized intersections and their capacity must be maximized. This paper aims to investigate the difference of the mobility performance of the right-turn guide lines in Japan and Yellow-Box pavement markings in the Philippines in terms of saturation flow rate, trajectory variation and speed. The analysis reveals that the turn guide lines are effective in achieving small turning vehicle trajectory variation and high saturation flow rate which are affected by the traffic signal phasing and the geometric layout of the turn lanes of the signalized intersection. The absence of guide lines of yellow box pavement markings creates cross-maneuvering behavior that lower the saturation flow rate of the turning lane.

DOI： 10.11175/easts.12.1637

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A Factor Analysis of Traffic Accident Frequency by Type on Major Road Sections in Japan

WATANABE Kazuki, NAKAMURA Hideki

Asian Transport Studies Vol. 4 ( 2 ) page： 392 - 407 2016

Language：English Publisher：Eastern Asia Society for Transportation Studies

This study aims to identify influencing factors of traffic accidents on Japanese major roads through factor analysis and regression analysis for each accident type, considering their characteristics as rare events. The database consists of a five-year accident record and relevant road traffic condition data on major road sections in Aichi Prefecture, which includes the third largest conurbation area of Japan. From the results of the factor analysis, a trend of high accident rates in broad urban arterials is confirmed, and rear-end or side collisions are widely distributed in suburban areas. From the regression analysis, results reveal that the degree of impact by traffic volume is dependent on accident type, and suggests that several factors related to visibility have an influence on turning and side collisions. The study suggests that improving the quality of traffic flow on major roads by ensuring proper intersection spacing is important for establishing a safer road network.

DOI： 10.11175/eastsats.4.392

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Papers - NAKAMURA, Hideki