• Journal of Korean Society of Transportation
• /
• v.25 no.6
• /
• pp.111-120
• /
• 2007

More accurate vehicle trajectory data are now readily available through Differential Global Positioning Systems (DGPS). A variety of research opportunities emerge with utilization of such high resolution traffic data. A novel approach of this study is to explore drivers' responsive behavior to variable message signs (VMS) by using individual vehicle trajectories extracted from in-vehicle DGPS data. Responsive characteristics of drivers traveling on urban freeways, which can be represented by speeds and acceleration rates, under the provision of real-time traffic information through VMS are statistically investigated. In addition to conducting an ANOVA test, probability density functions of acceleration rates were estimated. The findings of this study can be used to understand the impact of drivers' workload when providing VMS messages on traffic flow patterns. Furthermore, results can be important fundamentals to assist in conducting more realistic traffic simulations.

• Science of Emotion and Sensibility
• /
• v.17 no.3
• /
• pp.117-128
• /
• 2014

As the main cause of car accidents is driver distraction, HUD utilization is important to boost drivers' front-observing. Recently, As HUD includes a variety of contents products have appeared on market, the possibility increases cognitive load while driving. The purpose of this study is that currently being used HUD contents how much affect drivers while driving. To investigate about it, the experiment is examined cognitive aspect with utilization aspect of different gender and illuminance environment. The study provides, in accordance with the internal and external illuminance, the visibility make a difference. The gap between the internal and external illuminance is higher, the visibility is better. Also, this study confirms that HUD's awareness of contents depends on driving information. Drivers concentrate more on higher related driving contents than lower ones.

• Journal of Korean Society of Transportation
• /
• v.20 no.2
• /
• pp.17-26
• /
• 2002

Driver's psychophysiological load is one of the key measures for evaluating the safety of the highway. The purpose of this study is to propose and to test the methodology of evaluating the length limit of tangent section using driver's psychophysiological load. Driver's psychophysiological data is represented by the data acquire by frontal and occipital lobe. In order to compare the differences between tangent segments and the orders, real road driving experiments were performed. We collected psychophysiological data during the operation of vehicles. The experimental data were analyzed using FFT (Fast Fourier Transform) and relative power spectrum tools. These routine produces the beta value which is a major factor in consideration of driver's condition. The results in this study are summarized as follows: (1) A new methodology of evaluating the length limit in tangent section of highway using driver's psychophysiological load was proposed. (2) It was observed that driver's work load at tangent section was three times lower than that at the other section types. The beta value at tangent section is 2.219, while that at general section is 0.821. (3) It was observed that the driver's work load was significantly dropped to 0.428 after the continuous driving of 4.2km tangent section. (4) Based on the experimental subjects(from 27 Years to 31). we suggest that 30 times of design speed(3.0 km) could be acceptable as the length limit of tangent section in highway rather than the Previous limit which is 20 times of design speed(2.0km).

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.32 no.5D
• /
• pp.445-451
• /
• 2012

Visual changes and speed changes in curved sections of highways are more dangerous than straight sections According to the enquetes conducted by Coalition for Transportation Culture in 1999, about 78% of drivers are dissatisfied with traffic guide and safety signs, with lack of visibility being the largest reason with about 27.9% of respondents indicating it as reason for dissatisfaction. In particular, the lack of visibility during nighttime or bad weather not only threatens driver safety due to poor delivery of information, but also affects the service level of highways. Because of this a new delineation must be installed and managed to enhance driver visibility. In this research, an optimal delineation system to enhance traffic safety is presented. In this research drivers effectively obtained information on highway alignment on the curved sections using a retro-reflection type delineation system and a newly-developed internal lighting delineation system to improve safety on the highways. A statistical comparison was conducted and analysis was done for the delineation systems that enhanced visibility through primary and secondary enquaetes. As a result, inside-lighting delineator will be selected in terms of safety at the curve sections. The inside-lighting delineator was more effective than the retro-reflection delineator on visibility, the necessity of reduction of speed and will reduce the hazard at curve sections. It is anticipated that when a delineation system based on this research is installed, a reduction in the number the number and severity of traffic accidents on curved sections will be reduced. In addition this system will more effectively provide drivers with information about highway alignment.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.31 no.3D
• /
• pp.403-412
• /
• 2011

On a curve radius, there is speed deviation because a driver who is on the curve radius can have visual distortion. The curve radius can be more dangerous than a straight radius by many reasons. Especially, visibility paralysis of delineator that is because of night and bad weather. Can pervert the information about curve sections, it threatens safety. More over accident risk is increased by influence to travel speed. Therefore, it needs to build and control delineators for driver's visibility. Therefore, this study focus on finding the two types of delineator(the retro-reflection and inside-lighting delineator) by insight-surveying and the operating speed are compared by survey and operating speed. Finally, inside-lighting delineator will be selected in terms of safety at the curve sections. The inside-lighting delineator was more effective than the retro-reflection delineator on visibility, the necessity of reduction of speed and will reduce the hazard at curve sections. Also, the study analyzes safety is guaranteed by the slight reduction of speed when the driver enters a curve radius with inside-lighting delineator. As a result, the inside-lighting delineator can give the information about horizontal and vertical profile effectively, so it can reduce the accident risk. And it can use to improve traffic safety on curve radius.

• Information and Communications Magazine
• /
• v.30 no.11
• /
• pp.32-38
• /
• 2013

2020년 자동차산업의 핵심 키워드는 새로운 교통수단과 이동 서비스를 제공함으로써 새로운 비즈니스의 기회를 창출해야 하는 '이동성의 재발견', 글로벌시장의 다양한 소비자에게 신속하고 효과적으로 대응할 수 있는 시스템을 모색해야 하는 '전방위적 유연성', 미래사회 산업의 패러다임 변화에 대응하기 위해 자동차업체 이외의 new players의 참여를 유도하고 공존할 수 있는 열린 산업문화를 구축해야 하는 '소통과 협력', 미래경쟁력 확보를 위해 핵심기술의 선점과 상품화 노력을 강화해야 하는 '첨단기술의 융합'으로 요약할 수 있다. 그리고 미래 자동차산업의 경쟁력은 자동차 자체를 만드는 기술력 보다는 융합기술을 접목한 신서비스의 소비자 니즈 충족이 관건인 점을 감안할 때, 최근에 관심이 집중되고 있는 스마트카에 대한 적극적인 대처가 미래 자동차산업의 경쟁력을 확보하고 우리나라 자동차산업의 지속 성장을 보장할 수 있다고 판단된다. 이러한 스마트카는 운전자 지원이 중요하고 운전자 수용성, 사회적 수용성, 산업적 수용성의 기본원칙을 만족해야 하며 여기서 운전자 지원의 형태로는 인식의 지원, 판단의 지원, 조작의 지원을 그리고 지원의 기능으로는 크게 지각기능의 확대, 정보제공, 경보, 사고회피 지원제어, 운전부하 경감제어를 들 수 있다. 운전자 수용성이란 스마트카의 다양한 기능들이 가능한한 운전자에게 쉽게 전달되어야 하고 운전자가 이들 기능들을 과신하여 의존하는 일이 발생해서는 안된다는 것을 의미한다. 아울러 스마트카의 기능은 어떤 조건에서 효과가 어느 정도로 기대될까를 분명히 정해둘 필요가 있다. 즉 사회적 측면에서의 표준화, 법규화가 병행되어야 함을 의미하고 이것이 사회적 수용성이라고 할 수 있다. 마지막으로 산업적 수용성이란 자동차 산업은 기존 사업을 지속 성장시키고 new players에게는 새로운 사업에 참여할 수 있는 기회가 정당하게 주어져야 함을 의미한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2010.06b
• /
• pp.328-332
• /
• 2010

교통사고는 운전자, 차량, 주변 교통상태, 도로 및 교통시설 등의 여러 요인이 복합적으로 작용하여 발생하지만, 많은 경우 운전자의 운전 행태가 가장 큰 영향을 미친다. 본 논문은 이러한 운전자의 운전 행태를 분석하여 점수화 하여 보여줌으로써 운전 행태를 개선할 수 있도록 도와주는 정숙 운전 지수 표기기 개발에 관한 것이다. 연구에서는 MEMS 기반 3차원 가속도 센서와 3축 지자기 센서, GPS 등 모션 센서들을 이용하여 운전 안정성 / 승차감 지수를 측정, 저장하고 정량적으로 보여 줌으로써 운전자의 운전습관을 개선할 수 있도록 해 준다. 실제 구현에는 정숙 운전 지수 계산에 필요한 모든 센서를 이미 포함하고 있는 아이폰을 이용하였으나, 내비게이션 시스템이나, 차량용 블랙 박스 등에 최소한이 센서를 부가 장착함으로써 적용이 가능하다.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.1 no.1
• /
• pp.52-57
• /
• 2002

A simulation tool for an optimal ATIS design and drivers' dynamic route choice behavior analysis is developed, which is applicable to urban networks. Due to the difficulty to make drivers feel the time pressure according to traffic conditions, current SP questionnaire survey type surveys have a limitation to capture correct driver reactions to real-time traffic Information provision. The simulator Is a web-based upgraded version, named WATiSim (Web-based ATIS Simulator), to quickly perform a wide population survey with a minimal cost using INTERNET Furthermore, the time pressure issue is lessened by its interface and simulation modules. After WATiSim mimicked a VMS based ATIS in a partial network of Seoul Metropolitan, reactions of drivers to various traffic conditions were surveyed through INTERNET and analyzed using a logit model. Drivers under the ATIS environment clearly understood the provided traffic information, and their reactions were closely related to traffic conditions, scheduled delay, trip purposes as well as toll charge if any.

• Journal of the Korea Society for Simulation
• /
• v.18 no.4
• /
• pp.9-20
• /
• 2009

Navigation system providing route-guidance and traffic information is one of the most widely used driver-support system these days. Most of the navigation system is based on the 2D map paradigm so the information is ed and encoded from the real world. As a result it imposes a cognitive burden to the driver to interpret and translate the ed information to real world information. As a new concept of navigation system, augmented-reality navigation system (AR navigation) is suggested recently. It provides navigational guidance by imposing graphical information on real image captured by camera mounted on a vehicle in real-time. The ultimate goal of navigation system is to assist the driving task with least driving workload whether it is based on the abstracted graphic paradigm or realistic image paradigm. In this paper, we describe the comparative studies on how map navigation and AR navigation affect for driving tasks by experimental research. From the result of this research we obtained a basic knowledge about the two paradigms of navigation systems. On the basis of this knowledge, we are going to find the optimal design of navigation system supporting driving task most effectively, by analyzing characteristics of driving tasks and navigational information from the human-vehicle interface point of view.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.30 no.4D
• /
• pp.395-402
• /
• 2010

The seriousness of a traffic accident appears relatively higher on the curve sections compared with the straight sections due to a change in speed caused by a change in the driver's sight. In particular, the visual distortion phenomenon, one of the dangerous factors taking place on the curve sections, appears different according to the road's geometric design. Although it is a genuinely principal design factor which should be necessarily considered in designing a road, the previous researches on establishing the design standards for it have been insufficiently conducted. As a result, the establishment of the road design standards for the curve sections considering the sight distortion phenomenon is desperately required. This research examined the previous researches on the driver's behaviors, the driver's sight characteristics and the perceived curve radius on the curve sections, and developed the theoretical model of perceived curve radius to which a mathematical technique is applied in consideration of the visual distortion phenomenon on the two-lane curve sections in a local area. In addition, after the theoretical visual distortion was calculated on the basis of the theoretical model of perceived curve radius, the range of error on the theoretical recognition radius model formula was verified through comparing it with the previous researches' experiential visual distortion level and analyzing both of them. As a result, it was observed that as the curve radius practically increases in the theoretical recognition curve radius, the range of error tends to go down, which reflects well the characteristics of the curve sections on the road. Based on this research, it is expected that this research will be helpful to eliminate the safety defects when designing the curve sections and contribute to develop the road design standards considering human factors in the future.