Faculty Profiles - NAKAMURA, Hideki

Papers - NAKAMURA, Hideki

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Needs for the Image Processing Technique as a Convenient Traffic Flow Analysis Tool and its Practical Issues

Vol. Vol.42, No.3 page： 20-27 2007.5

Characteristics of Breakdown Phenomena in Japan Urban Expressway Merging Sections

Shawky, M. and Nakamura, H

86th TRB Annual Meeting page： 10 pages, CD-ROM 2007.1

Signalized Intersection Design and Operations: Experiences in Germany and Japan

Tang, K and Nakamura, H.

7th International Conference of Chinese Transportation Professionals Vol. Shanghai 2007

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

Shawky, M; Nakamura, H

TRANSPORTATION RESEARCH RECORD ( 2012 ) page： 11 - 19 2007

Language：Japanese Publisher：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 Vol. 2007 ( 0 ) page： 324 - 324 2007

Language：English Publisher：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 Vol. 2007 ( 0 ) page： 277 - 277 2007

Language：English Publisher：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 Vol. 7 ( 0 ) page： 2412 - 2424 2007

Language：English Publisher：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 Vol. 2007 ( 0 ) page： 318 - 318 2007

Language：English Publisher：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 Vol. 7 ( 0 ) page： 2533 - 2545 2007

Language：English Publisher：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 Vol. 2007 ( 0 ) page： 330 - 330 2007

Language：English Publisher：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 Vol. 7 ( 0 ) page： 2470 - 2485 2007

Language：English Publisher：Eastern Asia Society for Transportation Studies

DOI： 10.11175/easts.7.2470

CiNii Research

An Estimation Method of Hourly Traffic Demand Fluctuation throughout a Year for the Performance-oriented Highway Planning and Design

UTSUMI Taisuke, NAKAMURA Hideki, WATANABE Masamitsu

INFRASTRUCTURE PLANNING REVIEW Vol. 24 ( 24 ) page： 825 - 834 2007

Publisher：Japan Society of Civil Engineers

The authors have been advocating performance-oriented highway planning and design methodology in Japan. For this, it is necessary to estimate the hourly traffic demand fluctuation on a planned highway section throughout a year. This study proposes a method to estimate it within two phases; estimating the daily traffic demand phase and setting the hourly traffic demand coefficient phase, in consideration of potential hourly traffic demand. Estimates for each category, corresponding to road characteristics can be calculated using this method. This procedure enables the performancecheck of any planned highway sections throughout a year by inputting traffic demand into the respective design performance curve.

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

Vol. No.34 page： 4ページ，CD-ROM 2006.12

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

Shawky, M. and Nakamura, H.

Vol. No.34 page： 4ページ，CD-ROM 2006.12

An Investigation on Roundabout Design and Operational Performance

Vol. No.34 page： 4ページ，CD-ROM 2006.12

A Study on Quantification of Street Level of Service Regarding Land Access

Vol. No.34 page： 4ページ，CD-ROM 2006.12

Evaluation of Performance Measures for Two-Lane Expressways in Japan, Transportation Research Record Reviewed

Catbagan, L.J. and Nakamura, H.

Transportation Research Board page： 111-118 2006.12

Reproducing Hourly Traffic Demand Fluctuation through a Year

Vol. No.34 page： 4ページ，CD-ROM 2006.12

Street Structural Treatments of On-street Parking

Vol. Vol.41, No.6 page： 40-44 2006.11

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

Suzuki, K. and Nakamura, H.

13th World Congress on Intelligent Transportation Systems page： 8 pages in CD-ROM 2006.10

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Papers - NAKAMURA, Hideki