Recently, the percentage of traffic accident by elderly driver is increasing. According to researches of all accident types, the accident rate by the elderly drivers at right-turn in unsignalized intersection is higher compared to young drivers. This study develops the collision avoidance assistance system with crossing vehicle in unsignalized intersection rightturn. First, this paper describes the system to search the command value of waiting time and acceleration by using the cost function on the right-turn model and risk assessment index. Next, to evaluate the five types of cost function, the subjects evaluated each assistance system using driving simulator. In the experiment, the subjects evaluated the systems in three scenario; 1) system-equipped vehicle merge the front of the ego vehicle 2) system-equipped vehicle merge the rear of the ego vehicle 3) ego vehicle is controlled by the assistance system automatically. Finally, the experimental results show that the right-turning assistance systems are acceptable for drivers.

In Japan, vehicle to vehicle collisions and vehicles to motorcycles, bicycles and pedestrians are decreasing overall, however, still high number of accidents are occurring at intersection and fatalities and injuries in intersection accidents account for a half of all traffic fatalities and injuries. Especially, the number of traffic fatalities and injuries was highest when automobiles making intersection right turn. From those statistics “intersection right turn collision avoidance system” is intensely required. Our main research objective is to develop collision avoidance system at intersection right turn without depending on C2X/X2C communication. In this paper, we focus on the situation that an object darts out from blind spot of congested oncoming vehicle at intersection right turn. In this scenario, it is difficult to avoid collision by only conventional collision avoidance system because ttc is too short. In order to avoid collision with the darting out object, we design a system called Proactive Braking System (PBS). PBS applies brake assistance to decelerate to safe speed that collision can be avoided collision by emergency braking system (EBS) before the darting out is detected. Full-vehicle simulation using IPG CarMaker® to verify the effectiveness of the proper safe speed control system.

Recently, Advanced Driver Assistance System (ADAS), such as Autonomous Emergency Braking (AEB), Adaptive Cruise Control (ACC), have been widely used. In the future, autonomous driving is going to spread. Autonomous driving is doing research and development in present. When ADAS does not work for some reason, drivers are required to understand immediately what states of ADAS is in. Take over driving operation must be as soon as possible. Visual interface enables us to understand the states of ADAS. It is important for driver to understand the visual image to take over driving operation appropriately. In this paper, we compared traditional visual interface and new one. The traditional visual interface is constructed by symbols that indicate the states of the system, ON/OFF. On the other hand, the new visual interface is constructed by “avatar symbols”. Experimental studies using driving simulator showed the effectiveness in the driver’s brake operation, such as braking position and maximum deceleration.

These days, in Japan, there are needs for the cars which is concerned for the environment by the spread of the using of the hybrid vehicle and electronic vehicle. In addition, there is need for the transportation for elderly people. Thus the personal mobility vehicle is expected for solving the problems such as economical uselessness, environmental and elderly society. We should study about the driving position and the vehicle operation system in order to be able to drive Personal Mobility Vehicle (PMV) easily. Therefore we constructed the new Driving Simulator (DS). It can change the driving position, the operation system and the various vehicle specification which is assumed as PMV. In this research, we experimented by DS. The experiment is that draw a comparison driving position between driving operation system. In driving position, there are three different heights of heel distance that refers to distance of hip point and heel point when sit down. In driving operation system, there are a traditional steering wheel which used for various vehicle and a new operation system which is used when operate an airplane. In experiment, participants drove on double lane change course based on ISO3888-2 in respective conditions. After that we analyzed about yawrate and total steering angle of front wheel.

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 compared with other vehicles. Because of these feature, PMV needs to be used with pedestrian, so PMV also need to be secure. The two PMV, parallel two-wheel vehicle and bicycle, have features of each. 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. For more elucidating, we still need to investigate unstable situation of the vehicle.

As vehicles existing many types, for example passenger vehicles or trucks, buses, there are many type roads, for example narrow country road or wide arterial highway, expressway. Therefore, it is important to implement countermeasures of safety in responding to road environment for constructing high safety road traffic society. In the former study, the author classified road types by depended on the road environment, for example the road width or with or without of centerlines, divided roads or non-divided roads and clarified characteristics of traffic accident types or violations of laws by road type using traffic accident integrated data stored at Institute for Traffic Accident Research and Data Analysis (ITARDA). However, it is difficult to construct specific countermeasures for traffic safety using factors only traffic accident types or violations of laws. So, it is important to clarify other factors, for example constitutions of accident vehicle type or hazard perception velocity of accident drivers, high-accident time zone. In this study, the author analyzed constitutions of vehicle type or hazard perception velocity, time zone by road types, using traffic accident integrated data stored at ITARDA, and clarified characteristics of traffic accident situations of each road types.

In late years, it is increase that reverse-run , that is to say illegal direction run in expressways. In this paper, we made new approach of prevention for reverse-run in expressways. Because there aren’t effective conventional road sign to prevent reverse-run. So we came up with new road sign, which is applied Illusion technology. It’s method of 3D trick art. We assume this new sign are easy to understand reverse run directly to driver. We designed two types drawing. One is “Virtual Pole” and another is “Virtual Hole” which are described on the road surface. According to experimental by Drive simulator, ”Virtual Pole” was easy to notice in middle high speed, and it was recognized that “Virtual Hole” was easy to cause braking. There are possible to prevent reverse-run.

The Chiba Experimental Station, part of the institute of Industrial Science of the University of Tokyo, is an important field for the study which required large-scale experimentation. In this paper, history of Chiba Experimental Station and a portion of the mobility research from a number of studies that have been performed in Chiba Experimental Station were introduced. In addition, the mobility research field for the transportation and logistics were described.

The objective of this study is proposing the public transportation planning that increases frequencies for elderly people to go out in local area with new modes of transportation. And we verify feasibility and evaluate costs and convenience of the proposed public transportation. we use case studies of public transportations in Kamaishi city, Iwate prefecture and Wajima city, Ishikawa prefecture. In Kamaishi city, we simulate separating bus lines into trunk lines and branch lines to investigate trade-off relation between a transferring and transportation service by on-demand bus. and to confirm balance calculation. About Wajima city, we investigate the impact of golf cart driving on public roads by analysing video data and simulate converting public transportation from bus lines to golf cart to confirm balance calculation. As a result, about Kamaishi, the trade-off relation is resolved as a certain number of users and they hope to be able to use on-demand bus. In consequence of the cost simulation, spending is reduced by almost 5 percent. As a result, about Wajima, we reveal the impact of golf cart driving on public road. Automatically operated golf cart can be run by a half running cost of Noranke bus in consequence of the cost simulation.

The author defines a Personal Mobility Robot (PMR) as a personal mobility device faster than walking but not so fast as an automobile, requiring less resources and energy than an automobile, applying robotic technologies to improve safety, compactness, convenience, and so on. The author and his colleagues acquired exceptional measures of road traffic law and technical standard of motor vehicles in order to enable practical experiments of PMRs those do not conform to specific articles of technical standard. A considerable amount of practical experiments of several types of PMR were carried out on the sidewalks of Tsukuba for several years. The following facts were found; PMRs are effective mobility means in the real world; most pedestrians accept PMRs to pass sidewalks; PMRs can be operated safely among pedestrians and bicycles on sidewalks. New types of PMR are being developed to be committed to the practical experiments and the number of participants in the experiments are increasing.