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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Transportation
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Journal DOI :
Korean Society of Transportation
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Volume & Issues
Volume 25, Issue 6 - Dec 2007
Volume 25, Issue 5 - Oct 2007
Volume 25, Issue 4 - Aug 2007
Volume 25, Issue 3 - Jun 2007
Volume 25, Issue 2 - Apr 2007
Volume 25, Issue 1 - Feb 2007
Selecting the target year
Accuracy Estimation of Video Image Detector Considering Heteroscedasticity
Lee, Cheong-Won ; Song, Yeong-Hwa ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 7~15
The accuracy of a Video Image Detector (VID) is gradually reduced due to various environmental and mechanical factors. However, there has been no systematic research about the decrease of VID accuracy. To maintain a proper level of VID accuracy for advanced traffic management, a regular VID calibration process needs to be introduced. However, the calibration cannot be performed frequently because of the cost. In this study, the researchers collected field data for accuracy estimation and inferred an accuracy decreasing function by using regression and considering the heteroscedasticity problem. Using the invented data collection equipment which was used for checking adaptability, some data in the field were collected and analyzed. Although the data were limited, the results are promising. More data need to be investigated in the future and this study will help to maintain the data quality for broad utilization of the data in ITS centers.
Study of Effectiveness of Signal Preemption Strategy Depending on Train Speed at Intersections Near Highway-Railroad Grade Crossings
Jo, Han-Seon ; Kim, Won-Ho ; O, Ju-Taek ; Sim, Jae-Ik ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 17~26
Because the prime objective of the current preemption methods at signalized intersections near highway-railroad grade crossings(IHRGCs) is to clear the crossing, secondary objectives such as safe pedestrian crossing time and minimized delay often are given less consideration or are ignored completely during the preemption. Under certain circumstances state-of-the-practice traffic signal preemption strategies may cause serious pedestrian safety and efficiency problems at IHRGCs. An improved transition preemption strategy(ITPS) that is specifically designed to improve intersection performance while maintaining or improving the current level of safety was developed by Cho and Rilett. Even if the new transition preemption strategy improved both the safety and efficiency of IHRGCs, the performance of the strategy is affected by train speed. Understanding the impact of this factor is essential in order to implement ITPS. In this paper, the effects of train speed were analyzed using a VISSIM simulation model which was calibrated to field conditions. It was concluded that the delay is affected more by train speed than the transitional preemption strategy and the safety of the intersection is not affected by train speed once an advanced preemption warning time(APWT) is equal to or greater than 90 seconds.
An Evaluation of Airports' Service Provision Based on Consumer Perception
Park, Yong-Hwa ; Choe, Jeong-Gyu ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 27~37
This research has been carried out for assessing the competitiveness of the major Asian airports based on the quality of service provision. Five airports were selected for evaluation: Hong Kong, Singapore Changi, Tokyo Narita, Bangkok Don Muang, and Seoul Incheon International Airport. For evaluation of these selected airports, AHP and IPA techniques were applied. Five main factors were defined through a literature review of previous studies: concreteness, convenience, economic efficiency, respondency, and accessability. Hong Kong International Airport had the strongest airport in the Asian region, followed by Incheon International Airport. The least competitive airports were Bangkok and Tokyo Narita International Airport in regards to users' perception for the provision of services at the airport.
The Analysis of the Differences of Driving Behaviors According to Drivers' Personal Characteristics and the Causal Relationship between Personal Characteristics and the Number of Traffic Violations
Lee, Hyeon-Ju ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 39~50
This study investigated how drivers' cognitive characteristics, such as perception-motor skills and safety-seeking motivation; personal characteristics, such as sensation-seeking disposition coping with physical and social dangers; their self-perceived driving ability; and their normal driving behaviors influence the number of driving violations. 352 drivers participated in the study. MANOVA was performed in order to test the differences in their driving behaviors according to their level of sensation-seeking disposition and driving ability, and Structural Equation Modeling was used to examine the causal relationships among their demographic characteristics, sensation-seeking dispositions, driving ability, driving behaviors and the number of violations. The results indicated that drivers who had higher perception-motor skills seemed to be careful with pedestrians. From the results, drivers who had somewhat higher safety-seeking motivation tended to violate fewer traffic regulations intentionally or accidentally and showed more positive driving behaviors. Furthermore, drivers who had higher perception-motor skills, higher sensation-seeking disposition, and lower safety-seeking motivation had a tendency to violate intentionally more traffic regulations. The older drivers showed driving behaviors that were careful of pedestrians. The drivers who had higher sensation-seeking disposition and longer driving careers violated more traffic regulations, both intentionally and accidentally. Results from LISREL indicated that the predictive variables directly or indirectly influenced on drivers' violation numbers (
=341.62(p=.00), GFI=.94. RMR=.10).
The Safety Improvement of National Highways through Small Towns with Positive Guidance
Sim, Gwan-Bo ; Lee, Su-Beom ; Jang, Seok-Min ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 51~61
Increasing traffic volumes and excessively high speeds on national highways through small towns often increases the frequency of accidents. Extensive paved areas, narrow sidewalks, median barriers and little greenery have resulted in a dangerous and destructive living environment for residents. The reason for this problem is that throughways were expanded without considering the harmony between the throughways and the small towns. Construction of bypasses and reclassification of highway functions would solve the problem by reducing vehicle speeds in small towns, but this method is too costly and time consuming. Therefore, this study analyzes national highways through small towns as a case studies using positive guidance in order to improve safety and develop alternatives. As a result of the case study, the biggest problem was observed to be the excessively high vehicle speeds, This study also identified places were information should be given or posted but is currently absent. Therefore, this study concludes that notional highways through small towns need installation of speed reduction facilities and additional information provision to drivers.
Correlation Analysis and Estimation Modeling Between Road Environmental Factors and Traffic Accidents (The Case of a 4-legged Signalized Intersections in Cheongju)
Park, Jeong-Sun ; Kim, Tae-Yeong ; Yu, Du-Seon ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 63~72
The purpose of this study is to develop a traffic characteristic analysis, a correlation analysis with the variables of traffic characteristics, and accident estimation models while recognizing the seriousness of the traffic accidents. The analyses deal with the 181 4-legged signalized intersections that accounted for 1,183 out of 3,115 accidents in Cheongju in 2004. After measuring ADT, intersection area, average lane width, elevation, and other items as independent variables and the number of traffic accidents, the traffic accident rate (accidents per million entering vehicles) and equivalent property damage only (EPDO) figures as dependent variables which are estimated as influencing signalized intersection accidents, the estimation models are developed using correlation analysis and multiple regression analysis. In the analysis of the number of traffic accidents, the model indicates an
of 0.612, and five independent variables are taken as significant factors. In the analysis of traffic accident rates, the model indicates an
of 0.304 and five significant factors, including intersection area and ADT. Also, for the analysis or the EPDO numbers, which coincides with understanding the seriousness of the traffic accidents and the traffic characteristic analysis, the model indicates an
of 0.559, and four independent variables (ADT, main street average lane width, elevation, and speed limit) as significant factors.
Analysis of Breakdown Characteristics by Lane Interaction at Freeway Merging Area with a View of Time and Space
Kim, Sang-Gu ; Kim, Yeong-Chun ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 73~81
The purpose of this paper is to perform a basic study on the interaction between lanes, which can be achieved through analyzing traffic breakdown at the microscopic level. Using aerial photographic data for the microscopic analysis, this study analyzed the characteristics of traffic flow at a merging area. This research produced aggregated traffic data such as flows, speeds, and densities in 30 second intervals by lane for the macroscopic analysis and individual headway data by lane for the microscopic analysis. The paper contains an analysis of lane characteristics through flows, speeds, densities, and headway variations and also investigates the influence of ramp flows on mainline flows with space-time diagrams. Firstly, the merging area in this study is divided into three sections: before-merging, during-merging, and after-merging. The transition process was analyzed at each lane. Secondly, the breakdown was observed in detail with data divided in 50-foot units. The breakdown was checked through the relationships between ramp and freeway mainline flows, various techniques were proposed to analyze the breakdown, and the formation of breakdown was introduced as three stages in this study. In the near future, the findings of this study could contribute to determining the dynamic capacity on freeways by easily understanding changeable traffic breakdown patterns over time and space.
Evaluation of Sidewalk Level of Service Considering Land Use Patterns
Kim, Yong-Seok ; Choe, Jae-Seong ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 83~93
Pedestrians and vehicle users should be treated with equal importance in urban street design. However, current street design suggests that the design criteria for sidewalks is based on the functional hierarchy of the vehicles, therefore it is necessary to develop sidewalk design standards that give more weight to pedestrians rather than vehicles. For this, this study suggests that the level of service of pedestrians should be considered in the process of designing sidewalks. Currently, level of service (LOS) criteria for pedestrians in the Korean Highway Capacity Manual are based on pedestrian volume, but the volume of pedestrians is seldomly estimated in practice. So, the current LOS criteria has limitations in terms of practical use. Also, the study assumes that the pedestrian flow rate is hardly the dominant factor that could affect the LOS of pedestrians at most urban sidewalks. In this context, the study considers a new LOS for sidewalk design based on the comfort of pedestrians while passing pedestrians coming from the opposite direction. Then the study attempts to link the new LOS criteria to the land use patterns using data of pedestrian traffic characteristics acquired from the field. In addition to this, the scope in which the suggested criteria can be applied is suggested.
The Effects of Driving Behavior Determinants on Dangerous Driving and Traffic Accidents in the Reckless Drivers Group: A Path Analysis Study
O, Ju-Seok ; Lee, Sun-Cheol ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 95~105
Speeding and drunken driving make drivers fail to detect hazards and cope with various driving situations. These behaviors also raise the possibility of being involved in traffic accidents and tend to increase the number of fatalities. The authors compared the driving behavior determinants of a rockless drivers group, consisting of individuals who have committed traffic accidents or offended regulations through drunken driving, with a normal drivers group. In the results, the reckless drivers group showed high scores of 'speeding' and 'drunken driving', and they also stated that they had more experiences of speeding, drunken driving and traffic accidents. In the path analysis study, it was found that the impacts of the rockless drivers group's 'risk sensitivity' and 'situational adaptability' on traffic accidents were stronger than those of normal drivers. This means 'risk sensitivity' and 'situational adaptability' can explain the origins of traffic accidents better in the reckless drivers group than accidents of the normal drivers group.
A Study on Vehicle Platoon Formation on Freeways (Platoon Generation Model)
Lee, Jun ; Jeong, Jin-Hyeok ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 109~120
This study developed a methodology that can reflect more realistic traffic flow to understand platoons on highways. The understanding of the phenomenon nay secure highway safety and authoritative credibility in highway planning. In this study platoons generated by 'random effects' of cars are modeled, and this model is validated using a real data set acquired from the Jayu Expressway in Kyonggi Province, Korea.
An Estimation of Generalized Cost for Transit Assignment
Son, Sang-Hun ; Choe, Gi-Ju ; Yu, Jeong-Hun ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 121~132
This paper addressed the issue of a generalized cost model for transit assignment. The model composed of walk time, waiting time (including transfer waiting time), line-haul time, transfer walk time, and fare. The weights of each component were supposed to be calculated using the stated preference (SP) data, which were collected prudently in order to reflect reality. The marginal rate of substitution and wage rate were applied to calculate the weights. The results showed that the weight of walking time per in-vehicle travel time (IVTT) was 1.507, the weight of waiting time (per IVTT) was 1.749, that of transfer time (per IVTT) was 1.474, and that of fare (per IVTT) was 1.476 for trips between inner-city areas in Seoul. Weights for each component were identified as 1.871, 1.967, 1.015, and 0.857, respectively, for trips between Seoul and Gyeonggi. Statistical significance existed between two cases and each variable was also statistically significant. Transit assignment using the relative weights estimated in this study was implemented to analyze the travel index in a macroscopic and quantitative basis. The results showed that average total travel times were 30.23 minutes and 63.29 minutes and average generalized costs were 2,510 won and 3,880 won for trips between inner-city areas in Seoul and between Seoul and Gyeonggi, respectively.
Development of Transit Assignment Model Considering an Integrated Distance-Based Fare System and In-Vehicle Congestion
Park, Jun-Hwan ; Sin, Seong-Il ; Im, Yong-Taek ; Im, Gang-Won ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 133~143
Previous studies on the transit assignment hardly show its achievement in research but have many limitations not only in theory but also in practice. This paper presents an integrated transit assignment model taking into account cost functions of multiple modes, such as auto, bus and subway, which represent an integrated network. An integrated transit network including cost functions and in-vehicle congestion needs to be developed. In addition, a link fare calculation model needs to be developed and applied to the model to calculate path travel costs. Based on these sub-models, a path-based traffic assignment model, which considers in-vehicle congestion and an integrated distance-based fare system in the integrated traffic network, is developed.
Optimal Link Length Design for Departure Time-based Link Travel Time Information
Kim, Jae-Jin ; No, Jeong-Hyeon ; NamGung, Seong ; Park, Dong-Ju ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 145~155
The objectives of this study aye to develop an on-line departure time-based travel time estimation method and to determine an optimal link length for the estimation. This study developed a link-based rolling horizon logic as the travel time estimation method. In order to determine an optimal link length, the information error of the travel time provision from the user's perspective was defined and employed as a selection criterion. It was found that, when the travel time aggregation size was set as five minutes, a link length of four kilometers gave the most accurate result.
Development of a Highway Vertical Alignment Analysis Algorithm and Field Test Using a Vehicle with Multiple Sensors
Yun, Deok-Geun ; Seong, Jeong-Gon ;
Journal of Korean Society of Transportation, volume 25, issue 2, 2007, Pages 157~165
In this research, a vertical alignment analysis algorithm was developed. The developed algorithm used acquired data from a vehicle with multiple sensors such as a global positioning system (GPS) an inertial navigation system (INS), and a distance measuring unit (DMI) to collect information about vehicle position and altitude. The vertical alignment analysis algorithm includes the identification of vertical tangent sections, the beginning and ending points of vertical curves, and the calculation of length of vortical curves. Also, the algorithm can help build models for vertical tangent sections and vertical curve sections. In order to verify the algorithm, a field survey was conducted at an actual highway section and the result of the field survey was compared to a highway CAD drawing.