A development of large-scale traffic simulation for the Tokyo Metropolitan road network to estimate the road network traffic flow dynamically, especially after the mostly completion of three expressway rings, named "Chuo ring", "Outer ring", and "Ken-o ring", is outlined. The development is aimed at the evaluation of various policies; including traffic management measures, such as reexamination of expressway toll pricing scheme, route guidance, inflow metering, and so forth, road planning and road design.
Traffic controls which encourage the efficient use of expressway networks are recently more needed to be introduced in Japan due to the completion of the Three Loops Roads' construction. A ramp metering is one of such traffic controls but almost all the realized ramp metering strategies aim to improve the local traffic conditions; the effects of these strategies on an entire network have not been completely understood. This paper studies a ramp metering strategy which minimizes a total travel time in an expressway network where no queuing congestion occurs. Specifically, after formulating the above control problem, we examine the characteristics of the ramp metering strategy （solution） through simple numerical experiments.
The midblock crosswalks can improve pedestrians’ accessibility while may decrease vehicle flow performance in arterials with the dense signalized intersections in an urban area. This study compares the effectiveness of different midblock crosswalk treatments in urban areas where nearby traffic signals are coordinated. Signalized single stage and two stage as well as unsignalized single stage and two stage crosswalks are evaluated in terms of vehicles and pedestrian delays against various demand levels. Signalized two stage crosswalks caused lower average user delays as compared to signalized single stage crosswalks. The ratio of average vehicle and pedestrian delays under optimal signal settings may differ for each crosswalk type even though the average user delays are nearly the same.
The bus should be operated smoothly along to the timetable for users to travel with comfort. Though bus have to take delay during stopping due to a red signal in a crossing. To avoid such stopping, Public Transportation Priority System （PTPS） are introduced. However, if there are lots of bus to pass one direction, there are few time for other direction traffic to pass. And, if there are buses on both direction, PTPS should decide one direction to more priority pass. Then, improving their functions are discussed and feasible experiment in modeled situation are required. In this paper, one of a PTPS demonstration is introduce.
Shooting omnidirectional video become easily conducted thanks to downsizing, light weighting, and price reduction of equipment such as cameras. In the field of road maintenance, daily maintenance works such as road patrol, complaint handling from road users, disaster prevention check, and response of disasters and accidents still has been conducted using paper-based information, although there are examples of using ICT such as CCTV. The authors studied the possibility of support for efficient and effective road maintenance works, by shooting the omnidirectional video on actual national highway and evaluating the possibility of utilization of the video by National Highway Office's staff.
A super wide-angle lens or a fisheye lens, which is commonly used for on-vehicle camera, generally gives distorted images, and the relative resolution becomes quite lower in the peripheral area of the sight. Therefore, when the on-vehicle camera sequentially observes and tracks a particular target area in a scene, the captured images inevitably include the images with both better and worth quality. This brings out a trade-off for superresolution process, between the number and the quality of input images. In this report we examine and discuss some conditions to obtain the optimal super-resolution result under such constraints.
Personal Mobility Vehicles （PMVs） are gaining remarkable popularity as a sustainable alternative transport mode for short distance trips. Before allowing PMVs on shared spaces in Asian cities with high pedestrian and cyclist demands, interactions between PMVs and other shared space users should be properly understood. This paper investigates Segway, which is currently one of the famous type of PMVs, riders’ reaction times under different mixed traffic and following conditions. As results suggest, under normal following conditions Segway riders respond differently for different modes of mixed traffic. Under unsafe conditions they tend to react similarly even the mode is different.
In this work, we studied characteristic of the original vehicle, which wheels have non-identical axis. This vehicle is based on the parallel two-wheel vehicle and bicycle, which are usually called personal mobility vehicle (PMV). As short distance travel, it is said PMV has many advance point like environment-friendly, small occupation area, and so on. Because of these feature, PMV needs to be used with pedestrian, so PMV also need to be secure. Our work aims to make the feature of the original vehicle clear and research how to utilize the features of usual two PMV, and put smallness, operability, and stability into practice. From the simulation, we proved this vehicle can control both pitch and roll axis by configuring the wheelbase as proper value. This article was presented at the JSME TRANSLOG 2016 on December 2, 2016.
As an effort to support the earthquake disaster reconstruction of the northeast （Tohoku） region, the project has collaborated to promote the research and development of a mobility integrated energy management system （EMS） that supports the sustainable development of a disaster resilience region. This study analyzes the charging behavior of the driver using driving simulator. As the results of experiments, we describe the effectiveness of navigation system for EV.
Driving Simulator （DS） is used in various research areas in recent years. However, to be used in more various fields, it is necessary to improve realistic sensation of DS than now. In this research, we chose sign and information board as subjects of evaluation. We conducted brain measurements to investigate the effect on the driver due to the presence or absence of information provision or its contents change. From the results, we will compare the real car environment with the DS environment and find a way how to close the DS environment to the real car environment in information recognition.