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Abstract

UTMS Society of Japan is researching on the various technologies and specifications for traffic flow control, using probe data to reduce CO2 emissions . We have developed an advanced traffic signal control system using probe data and detector data in combination. We are n...Lead moreUTMS Society of Japan is researching on the various technologies and specifications for traffic flow control, using probe data to reduce CO2 emissions . We have developed an advanced traffic signal control system using probe data and detector data in combination. We are now verifying the effect of this system through simulation. In this paper, we will report on the architecture of this system and provide the results of the simulation that have already been processed.

Abstract

With the development of various driver assistance systems using vehicle position, improvement of positioning accuracy is desired. GPS, widely used as a positioning system, can provide accuracy of a few meters in suburban areas. However, in urban areas, this accuracy can b...Lead moreWith the development of various driver assistance systems using vehicle position, improvement of positioning accuracy is desired. GPS, widely used as a positioning system, can provide accuracy of a few meters in suburban areas. However, in urban areas, this accuracy can be degraded to ten meters or more because of the reflection and blocking of GPS signals by tall buildings. In order to maintain accurate positioning in such an environment, it is important to develop a method of dead-reckoning which is robust against the surrounding buildings. In this paper, a new method of dead-reckoning is developed in order to improve the robustness in urban areas. As a result, the error of dead-reckoning in urban area has been reduced to less than 1/4 that of the previous method.

Abstract

Direct traffic smoothing effects are obviously produced by such structural measures as adding traffic lanes for a physical increase in traffic capacity. Considering the enormous amounts of money and time necessary for purchasing land and constructing lanes, however, the K...Lead moreDirect traffic smoothing effects are obviously produced by such structural measures as adding traffic lanes for a physical increase in traffic capacity. Considering the enormous amounts of money and time necessary for purchasing land and constructing lanes, however, the Kanto Regional Head Office of NEXCO East has also been laying stress on non-structural measures against traffic congestion, such as providing information using LED information signboards.Within the area of the Kanto Regional Head Office, traffic congestion occurs mostly at non-intersection sag sections. There have been concerns about congestion occurring at low traffic volumes and congestion worsening due to low traffic handling capacity during congestion.To reduce congestion where congestion occurs frequently, we attempted to increase traffic volumes by providing drivers with traffic information using LED information signboards (leveling lane usage before congestion and recovering speed after congestion), and certain effects were obtained as reported in this paper.

Abstract

In this paper, we focus on a distance estimation scheme using camera. Our distance estimation scheme is based on triangulation. The accuracy of camera based scheme is governed by resolution of camera, or equivalently the size of pixel. Therefore we introduce phase only co...Lead moreIn this paper, we focus on a distance estimation scheme using camera. Our distance estimation scheme is based on triangulation. The accuracy of camera based scheme is governed by resolution of camera, or equivalently the size of pixel. Therefore we introduce phase only correlation (POC) to estimate with subpixel accuracy. As a result of experiment, we will show that our scheme achieves less than 0.3m estimation error at the distance of 60m. Thanks to POC, the resolution of estimation reaches nearly 0.02 pixel, much less than one pixel.

Abstract

We developed a practical green wave (GW) drive assist system based on the common platform. During a field operation test (FOT) held in both suburban area and urban
area, we evaluated the feasibility and the functional effectiveness of the system.We developed a practical green wave (GW) drive assist system based on the common platform. During a field operation test (FOT) held in both suburban area and urban
area, we evaluated the feasibility and the functional effectiveness of the system.

Abstract

To promote sustainable and vibrant national and regional development, the National Institute for Land and Infrastructure Management is investigating methods and technologies for monitoring the passage of heavy vehicles, which is considered to have a significant impact on ...Lead moreTo promote sustainable and vibrant national and regional development, the National Institute for Land and Infrastructure Management is investigating methods and technologies for monitoring the passage of heavy vehicles, which is considered to have a significant impact on the life span of road infrastructure. In this paper, we describe a fundamental verification experiment on monitoring a vehicle’s driving location - a basic technique for supporting appropriate driving of heavy vehicles - and report the results.

Abstract

When persons intend to let the heavy vehicle that its size or weight is exceeding the legal limit for free running on roads run in Japan, persons who operate such vehicle have to select the route by themselves, and have to receive the permits from the road administrators ...Lead moreWhen persons intend to let the heavy vehicle that its size or weight is exceeding the legal limit for free running on roads run in Japan, persons who operate such vehicle have to select the route by themselves, and have to receive the permits from the road administrators of the routes. They can let such vehicles run on roads actually after the permission. From such a background, it is difficult to evaluate the validity of the route. Therefore, the result of the design and development work of the system which makes it possible to select the most suitable route for the heavy vehicle under given conditions automatically is reported.

Abstract

The weights of the vehicles are measured indirectly with utilized data can be collected from onboard OBD-II by using the digital tachograph developed for the purpose of support for eco-driving of commercial vehicles, in addition, the above results are compared with the re...Lead moreThe weights of the vehicles are measured indirectly with utilized data can be collected from onboard OBD-II by using the digital tachograph developed for the purpose of support for eco-driving of commercial vehicles, in addition, the above results are compared with the results measured under quiescent conditions, also mentioned is its applicability for safe driving, eco-driving, and the control of moving states of the vehicles using ITS.

Abstract

We have been working on many projects for giving the safe, secure and comfortable highway to drivers.In this report, we announce for the advanced road lighting technology with controlling depending on environment.It is easy for drives to affect the influence of the surrou...Lead moreWe have been working on many projects for giving the safe, secure and comfortable highway to drivers.In this report, we announce for the advanced road lighting technology with controlling depending on environment.It is easy for drives to affect the influence of the surrounding environment, especially the weather and traffic volume.
Controlling the road lighting depending on these factors, it improves visibility and vehicle-running conditions.We have been assessing the basic plan and the concept of this technology.

Abstract

This paper focuses on the new Intelligent Transport Systems (ITS) Master Plan 2.0 which is jointly developed by the Land Transport Authority of Singapore (LTA) and the Intelligent Transportation Society of Singapore (ITSS) representing the industry. The ITS Master Plan 2....Lead moreThis paper focuses on the new Intelligent Transport Systems (ITS) Master Plan 2.0 which is jointly developed by the Land Transport Authority of Singapore (LTA) and the Intelligent Transportation Society of Singapore (ITSS) representing the industry. The ITS Master Plan 2.0 provides a strategic leadership, guidance and support for advancing the applications, developments and interoperability of ITS in Singapore in the coming years as Singapore strives for a more connected and interactive land transport community. It offers a collective perspective for a wider and sustainable ITS ecosystem and developments in Singapore.

Abstract

Development of Energy-saving ITS project deals with an automatic operation and platooning for heavy trucks. We proposed an algorithm development for the trajectory generation of a control target for steering control. The algorithm is verified by field tests and simulations.Development of Energy-saving ITS project deals with an automatic operation and platooning for heavy trucks. We proposed an algorithm development for the trajectory generation of a control target for steering control. The algorithm is verified by field tests and simulations.

Abstract

From the experience of large disaster in 11th march 2011, we have again realized the importance of emergency evacuation. We have to have an effective evacuation plan in order to evacuate from the danger, such as Tsunami, and Nuclear emergency before it comes. We have been...Lead moreFrom the experience of large disaster in 11th march 2011, we have again realized the importance of emergency evacuation. We have to have an effective evacuation plan in order to evacuate from the danger, such as Tsunami, and Nuclear emergency before it comes. We have been studied evacuation plans with dynamic simulation in several cases.
This approach will improve comprehensive effectiveness of evacuation plan by improving not only plan itself. The viewpoint from the simulation will be used for education and drills in order to improve the public reactions. This paper shows a technical point of view for this approach based on our experience from actual studies.

Abstract

The payment system we are considering allows inserting an IC credit card into the OBE(on-board equipment) and processing cashless playment through communications between the vehicle and an RSU(road side unit)while driving.The payment system we are considering allows inserting an IC credit card into the OBE(on-board equipment) and processing cashless playment through communications between the vehicle and an RSU(road side unit)while driving.

Abstract

The Profile-based Traffic Signal Control is a next-generation distributed traffic signal control system which uses vehicle arrival forecast on approach to intersections. After extensive evaluation activities conducted under various conditions in a state-funded model proje...Lead moreThe Profile-based Traffic Signal Control is a next-generation distributed traffic signal control system which uses vehicle arrival forecast on approach to intersections. After extensive evaluation activities conducted under various conditions in a state-funded model project over a four year period from Fiscal Year 2006 to 2009, its original specification including enhancements and improvements from evaluation results was finalized in FY 2011. The Okayama Prefectural Police Department introduced the Profile-based Traffic Signal Control complying with the original specification to eight intersections in Okayama City for the first time in Japan in March 2012 verified its effect in mitigating congestion and reducing travel time in the subject area. This paper discusses the outline of the Profile-based Traffic Signal Control deployment and the result of comparison in the traffic situation between before and after its deployment.

Abstract

This paper focuses on the development of threshold-speed-based eco-cruise control model. The proposed model aims to minimize fuel consumption and CO2 emissions as well as improve driver’s comfortability. Host vehicle obtains topography information of downstream from leadi...Lead moreThis paper focuses on the development of threshold-speed-based eco-cruise control model. The proposed model aims to minimize fuel consumption and CO2 emissions as well as improve driver’s comfortability. Host vehicle obtains topography information of downstream from leading vehicle via vehicle to vehicle communication. To incorporate the acquired data, the acceleration level is calculated by considering rolling resistance, air resistance and grade resistance. If the speed of host vehicle is beyond threshold value, the acceleration will be recalculated. To evaluate an environmental impact of developed model, both fuel consumption and CO2 emissions are estimated by Comprehensive Modal Emissions Model.

Abstract

Toyota City Low-Carbon Society Verification Project aimed at constructing next-generation, low-carbon energy and society systems, consists of several projects to reduce CO2 emissions: 1) for housing sector, 2) for transport sector, 3) for commercial and public facility an...Lead moreToyota City Low-Carbon Society Verification Project aimed at constructing next-generation, low-carbon energy and society systems, consists of several projects to reduce CO2 emissions: 1) for housing sector, 2) for transport sector, 3) for commercial and public facility and 4) in the whole community. In this paper, we present the simulation results of operating additional buses, which is one of the TDMS(Traffic Data Management System) functions. By linking information of transports and predicting the demand, TDMS enables the following supports to citizens, transport operators and local government through IT system.

Abstract

This paper describes current development of intelligent transportation systems (ITS) services in Taiwan, and especially focus on Advanced Traveler Information Services (ATIS) field. In ATIS development in Taiwan, Taiwan government faces the lack of good traffic informatio...Lead moreThis paper describes current development of intelligent transportation systems (ITS) services in Taiwan, and especially focus on Advanced Traveler Information Services (ATIS) field. In ATIS development in Taiwan, Taiwan government faces the lack of good traffic information contents. To solve this problem, Chunghwa Telecom (CHT) develops a multi-source traffic information system to fuse and analyze data collected from VD, GVP and CVP. And CHT also deploys cloud platform to solve the scalability issue and huge historical data issue.

Abstract

The SCATS traffic management system by the Roads and Maritime Services offers road network authorities the flexibility to implement different congestion management policies in traffic signalized road networks. Different policies are required to acknowledge and balance: st...Lead moreThe SCATS traffic management system by the Roads and Maritime Services offers road network authorities the flexibility to implement different congestion management policies in traffic signalized road networks. Different policies are required to acknowledge and balance: strategic network management objectives, congestion cause and effects, and societal expectations. The balancing required is often site specific. This paper demonstrates the operation of SCATS in a number of scenarios within traffic simulation that cover different congestion management policies and conditions. Policies demonstrated include allocating the use of road space: to maximize network throughput in the current term, to strategically alleviate the cause of congestion in the medium term, and to promote a more-efficient network equilibrium in the long term. The paper provides road network planners and operators with a demonstrative guide of SCATS capability. This guide will allow practitioners to select the appropriate SCATS-delivered policy response for a given congestion management problem.

Abstract

Several map update systems that utilize Telematics services have been introduced.
Those map update systems can be categorized into two major methods. They are "Element-by-element map update" and "Map update by partial replacement."
The "Element-by-element map updat...Lead moreSeveral map update systems that utilize Telematics services have been introduced.
Those map update systems can be categorized into two major methods. They are "Element-by-element map update" and "Map update by partial replacement."
The "Element-by-element map update" ensures the connectivity of map data network after completing the update. Alternately, the aim of the "Map update by partial replacement" is to provide the updated map to end users quickly.

Existing "Element-by-element map update" systems require post-processing to re-create the map database using the existing map database along with the update information after receiving the update in order to retain the map network quality.

DENSO CORPORATION has developed a new "Element-by-element map update system" that does not require the re-creation of map database in post-processing. This system provides the advantages of both methods; getting updated map information to end users in a short period of time while retaining the network connectivity.

Abstract

In Japan we have been developing DSSS (Driving Safety Support Systems) of I2V cooperation systems and examining test systems in the fields. We install 700MHz band wireless communication system as one of I2V communication media into the DSSS. The DSSS is originally to assi...Lead moreIn Japan we have been developing DSSS (Driving Safety Support Systems) of I2V cooperation systems and examining test systems in the fields. We install 700MHz band wireless communication system as one of I2V communication media into the DSSS. The DSSS is originally to assist drivers to be safety. And we also try to apply the 700MHz wireless communication system to signal controllers for environmental use recently. We are examined to apply to right-turn actuated signal controllers firstly. In this paper we describe our fundamental algorithm of right-turn vehicle detection for the actuated signal controllers and report theresults of field test at an intersection in Tokyo.

Abstract

In expressways in Japan, the act of wrong-way driving among inexperienced drivers and head-on collision accidents which occur as a result are viewed as a problem.
As a solution to this problem, NEXCO East and NEXCO Engineering Niigata developed a sensing and warning de...Lead moreIn expressways in Japan, the act of wrong-way driving among inexperienced drivers and head-on collision accidents which occur as a result are viewed as a problem.
As a solution to this problem, NEXCO East and NEXCO Engineering Niigata developed a sensing and warning device which prevents wrong-way driving on expressways, and installed them on sites.
This device consists of an image processing device which senses the act of wrong-way driving and a warning device towards drivers.

Abstract

The needs to monitor the traffic situation by the image of the Pan-Tilt-Zoom(PTZ) camera is growing to offer safety and security to the expressway users. If the number of cameras to be monitored is increased, the visual monitoring on the operation becomes difficult. There...Lead moreThe needs to monitor the traffic situation by the image of the Pan-Tilt-Zoom(PTZ) camera is growing to offer safety and security to the expressway users. If the number of cameras to be monitored is increased, the visual monitoring on the operation becomes difficult. Therefore, it is requested to support the traffic control by detecting the abnormal traffic event automatically using video analysis technology. In this paper, we introduce the development result of the Traffic Control Support system realizing automatic information collection and event reporting from PTZ cameras, without increasing the operators' burden in the traffic control center.

Abstract

Information about wind is important probe data because it affects energy consumption and stability of a vehicle. We are developing a flow vector sensor (FV sensor) to measure the direction and the velocity of wind on the surface of a car. The size of the sensor is as smal...Lead moreInformation about wind is important probe data because it affects energy consumption and stability of a vehicle. We are developing a flow vector sensor (FV sensor) to measure the direction and the velocity of wind on the surface of a car. The size of the sensor is as small as 2 mm square and is fabricated with MEMS technology.
In this paper, the measurement method and fundamental characteristics of the sensor are described. Then, applications of the FV sensor are proposed, such as a probe sensor for the ITS and as a local (stand-alone) sensor for a car stability control system.

Abstract

The development of intelligent transport systems for public transport in Yogyakarta has been started in February 2008. An electronic ticketing system has been employed to replace the existing conventional ticketing system. Ticketing machine was placed in shelter. GSM has...Lead more The development of intelligent transport systems for public transport in Yogyakarta has been started in February 2008. An electronic ticketing system has been employed to replace the existing conventional ticketing system. Ticketing machine was placed in shelter. GSM has been chosen for data transfer. The same electronic card has been used for Gadjah Mada Student Card. Therefore, starting December 2011, Gadjah Mada University student card has been integrated with the ticketing system. A monthly ticket has been employed for integration. It has also been integrated with public transport ticketing system in Solo, a medium city located 60 km to the east of Yogyakarta in a cooperation with three Banks. At the end of 2012, ATCS has been employed for assisting buses by using gps. The last development is the use of vending machine for purchasing ticketing system, which has been started in the beginning of 2013.

Abstract

This radar can provide high resolution and wide angle detection: accomplished by (i) Wideband FM-CW and unique Sector Antenna, (ii) sophisticated signal processing.This radar can provide high resolution and wide angle detection: accomplished by (i) Wideband FM-CW and unique Sector Antenna, (ii) sophisticated signal processing.

Abstract

The intelligent transport systems (ITS) using 700 MHz band in Japan accommodates both Roadside-to-Vehicle Communications (RVC) and Inter-Vehicle Communications (IVC) while it is operated with a single channel, it assigns different time periods for transmissions by roadsid...Lead moreThe intelligent transport systems (ITS) using 700 MHz band in Japan accommodates both Roadside-to-Vehicle Communications (RVC) and Inter-Vehicle Communications (IVC) while it is operated with a single channel, it assigns different time periods for transmissions by roadside unit (RSU) and on-board equipment (OBE) respectively. A RSU sends the transmission timestamp and own transmission period (RSU slot) to surrounding OBEs, so each RSU need to maintain time synchronization accurately. In this paper, we investigate synchronization accuracy of plural RSUs practically by using synchronization with 1PPS signals from GPS receivers (GPS-sync) and synchronization by receiving packets from other RSUs (AIR-sync). The usefulness of these synchronization methods is verified and the problem under specific condition is found by field test. The measure for this problem will be shown.

Abstract

In Japan, the acquisition of probe data using ITS Spots began in 2011. This paper reports on the applicability of "Identified Probe Data," which can be used to identify individual vehicles for road administration, including congestion prevention and traffic accident preve...Lead moreIn Japan, the acquisition of probe data using ITS Spots began in 2011. This paper reports on the applicability of "Identified Probe Data," which can be used to identify individual vehicles for road administration, including congestion prevention and traffic accident prevention, and to provide private services, such as logistics support.

Abstract

Driver education is quite important even if ITSs spread. In order to educate drivers, supervisors or safe driving managers should obtain information about driving behavior. Recent computer and communication technologies have made it possible to obtain information concerni...Lead moreDriver education is quite important even if ITSs spread. In order to educate drivers, supervisors or safe driving managers should obtain information about driving behavior. Recent computer and communication technologies have made it possible to obtain information concerning driving behavior and record or send the information to a supervisor outside of the vehicle through wireless communication and the Internet. It is believed that the most efficient opportunity to teach safe driving is the moment when a driver is driving dangerously. Therefore, we have developed an Assistant System for Safe Driving by Informative Supervision and Training (ASSIST), a system created to prevent accidents based on our safe-driving theory. In this paper, we report development of web based management software with driver identification.

Abstract

Reduced capacity due to lane closure is inevitable while an incident occurs on the highway, which increases delay and speed variation. The homogeneity of vehicle speeds has been applied as an indicator of road safety, which can be achieved with enforced variable speed lim...Lead moreReduced capacity due to lane closure is inevitable while an incident occurs on the highway, which increases delay and speed variation. The homogeneity of vehicle speeds has been applied as an indicator of road safety, which can be achieved with enforced variable speed limit (VSL).
This research discusses 3 control strategies of Variable Speed Limits (VSL) during accident on highway. The real traffic and accident data will be collected from the traffic database and inputted to DynaTAIWAN to simulate the real traffic scenario on Taiwan highway for experiments.
In terms of the measure of effectiveness (MOE), the adaptive speed limit control can stabilize the vehicle flows, decrease the traffic jam and smooth the variation of vehicle speed. Furthermore, it can also improve traffic congestion by accidents, and enhance the efficiency and safety under the circumstances of expressway and freeway incidents.

Abstract

The NILIM has been conducting research on "individual information provision service" using ITS Spot Services. This service provides specific information to individual vehicles such as freight and information about specific destinations of a driver's choice.
In this pap...Lead moreThe NILIM has been conducting research on "individual information provision service" using ITS Spot Services. This service provides specific information to individual vehicles such as freight and information about specific destinations of a driver's choice.
In this paper, we first outline this individual information provision service. Next, we report the results of the investigation into the constraint conditions on the individual information provision service using a basic test system.
On the basis of these constraint conditions, we examine the negative effect on existing on-board units by the individual information provision service. And we examine the effect of broadcast information transmission for the special on-board units on the existing on-board units through verification tests. Lastly, the test results are reported.

Abstract

The paper investigated the traffic congestion catastrophe characteristics by comparing with the traditional traffic flow model on such a freeway. The results illustrate that there is the significant catastrophe characteristic dependent on the locations outside and interio...Lead moreThe paper investigated the traffic congestion catastrophe characteristics by comparing with the traditional traffic flow model on such a freeway. The results illustrate that there is the significant catastrophe characteristic dependent on the locations outside and interior of the tunnel. In this paper, using the catastrophe theory to model the macroscopic traffic model has higher correlation coefficients than the traditional traffic flow model. The catastrophe phenomenon on the entrance zone of the tunnel has more significant jumping feature than in the middle zone inner tunnel. Due to the traffic smoothing and safety following distance control within the long tunnel, the catastrophe feature will be reduced in the interior zone within the tunnel.

Abstract

Many traffic accidents in Japan are vehicle-to-vehicle crashes that occur at intersections, including crossing-path-accidents and rear-end-collisions. The principal cause is perceptual error by drivers. Driving Safety Support Systems(DSSS) were put in operation in Japan i...Lead moreMany traffic accidents in Japan are vehicle-to-vehicle crashes that occur at intersections, including crossing-path-accidents and rear-end-collisions. The principal cause is perceptual error by drivers. Driving Safety Support Systems(DSSS) were put in operation in Japan in 2011 with the aim of reducing such accidents. This system detects the presence of a collision partner(vehicle/pedestrian) in a position difficult to see for a driver approaching an intersection. That information is conveyed to the driver as quickly as possible via Vehicle-to-Infrastructure-Communications. If necessary, the system issues an alert to call the driver's attention to the risk of a collision. However, even though nearly two years have passed since the system began operating, little progress has been made in installing the related roadside infrastructure. Therefore, as a measure for promoting the near-term deployment of DSSS, this paper proposes an intersection passage support system that uses the existing traffic information infrastructure which is already widely installed.

Abstract

Firstly, a framework to define ITS knowledge and criteria for classification will be set up. Secondly, different knowledge maps according to corresponding criteria are drawn with the software package CiteSpace. Then, four types of stages: start-up stage, growth stage, mat...Lead moreFirstly, a framework to define ITS knowledge and criteria for classification will be set up. Secondly, different knowledge maps according to corresponding criteria are drawn with the software package CiteSpace. Then, four types of stages: start-up stage, growth stage, mature stage and decline stage are found to interpret the evolution process of Taiwan’s ITS knowledge maps by using Logistic equations. Finally, interpretations to depict results of 9 ITS application services are provided to demonstrate ITS research trends in Taiwan.

Abstract

On expressways in Japan, In order to call for attention and keep safe traffic, a lot of traffic accident measures such as large sign boards have been installed; however, traffic accidents are still remaining to occur frequently especially at high-accident location.Therefo...Lead moreOn expressways in Japan, In order to call for attention and keep safe traffic, a lot of traffic accident measures such as large sign boards have been installed; however, traffic accidents are still remaining to occur frequently especially at high-accident location.Therefore, as the new counter measures, visually appealing equipment such as highly visible lane marking and vision-guided system with light emitting delineator that are expected to restrain excess traffic velocity, a major cause of traffic accidents, are installed to examine; also, in order to analyze the effects of velocity control by each equipment, traffic velocity data before and after the installment are collected and compared. As the results, it is confirmed that the ratio of vehicles with excess velocity are decreased that means there are some certain effects on velocity restraint with the both measures.

Abstract

Currently, while radars installed to vehicles are widely studied, radars attached to road-side-units for safety systems have not been examined enough. The purpose of our research is to evaluate most suitable radar modulation for the infrastructure sensor by comparing diff...Lead moreCurrently, while radars installed to vehicles are widely studied, radars attached to road-side-units for safety systems have not been examined enough. The purpose of our research is to evaluate most suitable radar modulation for the infrastructure sensor by comparing different radar modulations with experiments in the actual environment. Obtained results so far show 2FCW modulation can detect vehicles and pedestrians with more accuracy than FMCW modulation. Further, we would like to examine a new radar modulation based on 2FCW in order to solve problems obtained from the public road experiment.

Abstract

For the purpose of improving the pedestrian actuated signal control system, we have improved the performance of the image sensor so that only pedestrians who walk slowly can be detected. Then, we conducted a field experiment of the "pedestrian actuated signal control syst...Lead moreFor the purpose of improving the pedestrian actuated signal control system, we have improved the performance of the image sensor so that only pedestrians who walk slowly can be detected. Then, we conducted a field experiment of the "pedestrian actuated signal control system by detecting the presence of slow-walking pedestrians" in which the green signal time is extended only when slow-walking pedestrians are crossing. The experimental results have verified that this control system enables a smoother traffic flow while ensuring safety.

Abstract

Vehicle-to-vehicle communication driving support system is being promoted in
ASV(Advanced Safety Vehicle) project under the leadership of Ministry of Land
Infrastructure Transport and Tourism. This system basic function requires vehicles to
communicate with other...Lead moreVehicle-to-vehicle communication driving support system is being promoted in
ASV(Advanced Safety Vehicle) project under the leadership of Ministry of Land
Infrastructure Transport and Tourism. This system basic function requires vehicles to
communicate with other vehicles in the vicinity in order to determine possibility of collision
and provide necessary driver support. Support method for driver assumed three types,
(i)Information, (ii)Alert, (iii)Information followed by Alert. To obtain knowledge of the most
suitable support type, driver receptivity for each support type is evaluated and verified using
general drivers in a real driving situation. This paper reports the results of empirical analysis
of vehicle data and subjective evaluation of the drivers

Abstract

In this study, we address a road infrastructure planning problem by relieving traffic congestion and thereby reducing CO2 emission. We model it as a mathematical optimization problem whose objective is to minimize the total travel time by improving road-infrastructures un...Lead moreIn this study, we address a road infrastructure planning problem by relieving traffic congestion and thereby reducing CO2 emission. We model it as a mathematical optimization problem whose objective is to minimize the total travel time by improving road-infrastructures under the given budget. We take into account the interactions between vehicles at road intersections. By introducing an approximation technique for the interactions, the proposed model is practical in terms of both computational time and accuracy of the obtained planning. Computational results show that the obtained optimal plan for the improvement of road-infrastructures significantly reduces CO2 emission.

Abstract

This paper proposes a merging assistance algorithm at an expressway ramp with vehicle-to-vehicle communications and considers the relationship between waiting time of merging vehicles and the penetration rate of the communication unit. When a vehicle with the unit in the ...Lead moreThis paper proposes a merging assistance algorithm at an expressway ramp with vehicle-to-vehicle communications and considers the relationship between waiting time of merging vehicles and the penetration rate of the communication unit. When a vehicle with the unit in the through traffic flow has a certain gap, it widens the gap ahead by reducing the speed to allow the merging. Regardless the penetration rate, the communications can assist the merging. When the mean headway is longer than 5 [s], the waiting time can be shortened by more than 50 %, while when the mean headway is shorter than 5 [s], the waiting time will becomes longer, and when the mean headway is 2.5 [s], the waiting time will be shortened by about 20 %.

Abstract

Driver’s low vigilance is a significant factor contributing to traffic accidents. Numerous methods were proposed to measure driver’s alertness level and warn driver when a potential risk exists. However, it is difficult to estimate driver’s distraction or drowsiness acc...Lead moreDriver’s low vigilance is a significant factor contributing to traffic accidents. Numerous methods were proposed to measure driver’s alertness level and warn driver when a potential risk exists. However, it is difficult to estimate driver’s distraction or drowsiness accurately from the observation of single aspect. This paper presents an integrated method which non-intrusively detects driver’s low alertness by considering both the performance of vehicle steering and the inattention facial features. We characterize driving performance by analyzing the manipulation behavior of steering wheel. A new image processing algorithm is designed to estimate driver’s gaze direction efficiently. The analysis results of these two different aspects are generally complementary and thus can be integrated to obtain accurate detection of driver’s inattention. Our method is adaptive and thus can tackle the significant variety across individuals. The proposed technique achieved high true positive rate (>99%) with low false positive error (0.17 times per hour).