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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 29, Issue 6 - Dec 2011
Volume 29, Issue 5 - Oct 2011
Volume 29, Issue 4 - Aug 2011
Volume 29, Issue 3 - Jun 2011
Volume 29, Issue 2 - Apr 2011
Volume 29, Issue 1 - Feb 2011
Selecting the target year
Aggregate-level Analysis of Auto Travel Dependency on Freeways in the Seoul Metropolitan Area
Go, Jun-Ho ; Lee, Seong-Hun ;
Journal of Korean Society of Transportation, volume 29, issue 6, 2011, Pages 7~16
This study investigates the degree of dependency on freeways when auto travelers make route choices in the Seoul Metropolitan Area. The investigation is conducted based on aggregated auto trip data, defining the degree of dependency as the proportion of auto trips selecting freeways in their travel paths. The analyses reveal that the trips departing from the areas with higher accessibility to freeways tend to exhibit higher dependency on freeways. In addition, the dependency is significantly affected by the travel time differences between two paths including and excluding freeways, respectively. The number of service interchanges was found to be one of significant factors for trips to Incheon and Gyenggi areas. The finding indicates that the factors affecting the degree of dependency on freeways may vary depending on the areas' characteristics. The findings would enhance the understanding of drivers' route choice behavior in Seoul at an aggregate level.
Comparison between Congestion Levels and Amount of
Emissions on Arterials
Gang, Jin-Gu ; O, Heung-Un ;
Journal of Korean Society of Transportation, volume 29, issue 6, 2011, Pages 17~23
It has been presumed that the amount of vehicle's
emission would highly related to vehicle's cruising speeds on highways. In this study, it was tested if vehicle's
emissions would relate to the types of highways and the level of congestion. The results showed that the amount of
emission changes depending on (1) the vehicles' cruising speeds (b) congestion levels, and (c) the types of intersections. It was found that the vehicle acceleration and deceleration methods increases the amount of
emission up to 12%. It was also found that it changed up to 30% and 40% depending on the level of congestion and the types of intersections, respectively. The findings imply that the amount of
emission from vehicles should be improved when vehicles' cruising speeds are well managed through congestion management.
Development and Validation of Situation Awareness Tests for Commercial Drivers
Lee, Gyeong-Su ; Gang, Ui-Jin ; Park, Sang-Hyeok ; Jeong, Hye-Seung ; Lee, Yong-Chan ; Son, Yeong-U ;
Journal of Korean Society of Transportation, volume 29, issue 6, 2011, Pages 25~37
This research aimed to investigate whether commercial drivers' situation awareness ability is related to their frequency and magnitude of caused accidents and penalty points. For the purpose of measuring drivers' situation perception and interpretation capacities, two tests named 'situation awareness test' and 'hazard perception test' were developed. The tests were based on the data from 299 commercial drivers (test drivers) using a driving simulator. The outcome of drivers' performance on situation awareness and hazard perception tests was designed to be categorized into 5 grades, classifying the best as grade 1 and the worst as grade 5. As the result, low grades on situation awareness test had positive relationship with accumulated penalty points, frequency of accidents and safety index. Grades on hazard perception test were also positively correlated with accident frequency and safety indices. This suggests situation awareness ability of commercial drivers is significantly related to traffic violations and accident causing tendencies.
Development of Traffic Accident Forecasting Models Considering Urban-Transportation System Characteristics
Park, Jun-Tae ; Jang, Il-Jun ; Son, Ui-Yeong ; Lee, Su-Beom ;
Journal of Korean Society of Transportation, volume 29, issue 6, 2011, Pages 39~56
This study proposed a traffic accident prediction model developed based on administrative districts of Seoul. The model was to find the relationship between accident rates and the representative land usage of the districts (development density) - the higher the development density (building floor area) is, the higher the traffic accident rate is. The findings showed that traffic accident statistics differ from (1) residential building floor area, (2) commercial building floor area and (3) business building floor area.
Study on Headways at Signalized Intersections Before and After Installation of Red Arrow Signal
Lee, Ho-Won ; Ju, Du-Hwan ; Hyeon, Cheol-Seung ; Park, Bu-Hui ; Kim, Dong-Hyo ;
Journal of Korean Society of Transportation, volume 29, issue 6, 2011, Pages 57~65
After heated discussion, National Police Agency decided not to install Red Arrow signal at such major intersections as Gwanghwamoon, Sejongro. The major issues can be summarized in the following reasons. The one is the conflict of color and symbol (red means STOP and arrow means PROGRESS), and it would confuse drivers and may cause traffic accident. The other includes high replacement cost. This paper delivered how much red arrow signal would affect (1) drivers start up delay time, (2) saturation flow rate and (3) vehicle headway. The result showed that there was no statistical difference in those even when a red arrow signal is placed.
Accident Models of Rotary by Vehicle Type
Han, Su-San ; Park, Byeong-Ho ;
Journal of Korean Society of Transportation, volume 29, issue 6, 2011, Pages 67~74
This study deals with the traffic accidents data from the Korean rotaries (circular intersections) to verify their characteristics affected by different vehicle types. This paper categorized the data into three groups based on vehicle types, and developed a set of accident models. The paper proposed two ZIP models and one negative binomial model through a statistical analysis for three vehicle types: automobile, truck and van, and others. The differences among those models were then statistically compared.
Evaluating Level of Quality for the Skyteam Cargo Services
Na, Ji-Eun ; Park, Yong-Hwa ; Yun, Sin ;
Journal of Korean Society of Transportation, volume 29, issue 6, 2011, Pages 75~83
This research explores the relative importance of factors and service items that influence the air cargo service quality for provision services by the Skyteam Cargo in the Korean market. In general, the Skyteam Cargo provides a package of services which are different functions and operations of service such item as Equation Heavy (heavy and large express freight), Equation (small express freight), Variation (special freight), and Dimension (general freight). To carry out the research, the expert questionnaire survey, the Analytic Hierarchy Process (AHP) analysis had adopted to evaluate the level of quality for the provision air cargo operation services by the Skyteam Cargo at Incheon International Airport. Based on an expert survey and the AHP, five core service factors, namely, infrastructure as installed facilities, reliability, promptness, efficiency, and safety are defined.
Quantitative Evaluation of the Level of Service of Sidewalk Using GPS
Kim, Yong-Seok ; Choe, Jae-Seong ;
Journal of Korean Society of Transportation, volume 29, issue 6, 2011, Pages 85~93
The width of sidewalk is one of the important factors constructing a pleasant pedestrian environment. The procedure for sidewalk width design based on the Level of Service is suggested in Korea Highway Capacity Manual. However, this manual does not give a difference between the sidewalk on the street with the passage of the subway, therefore, the different flow characteristic of these places is not appropriately reflected. Though the pedestrian flow in the subway encounters a frequent stop and go situation as like the platoon of vehicles, the similar condition is rarely observed at the urban streets. The new measure of LOS for sidewalk is in need. The study reviewed the prominent measure of LOS and carried out the outdoor experiment to evaluate the new measure. Particularity, GPS was used to collect the pedestrian foot path trajectory for the quantitative evaluation and the results from quantitative and qualitative are compared.
Development and Application of the Mode Choice Models According to Zone Sizes
Kim, Ju-Yeong ; Lee, Seung-Jae ; Kim, Do-Gyeong ; Jeon, Jang-U ;
Journal of Korean Society of Transportation, volume 29, issue 6, 2011, Pages 97~106
Mode choice model is an essential element for estimating- the demand of new means of transportation in the planning stage as well as in the establishment phase. In general, current demand analysis model developed for the mode choice analysis applies common parameters of utility function in each region which causes inaccuracy in forecasting mode choice behavior. Several critical problems from using common parameters are: a common parameter set can not reflect different distribution of coefficient for travel time and travel cost by different population. Consequently, the resulting model fails to accurately explain policy variables such as travel time and travel cost. In particular, the nonlinear logit model applied to aggregation data is vulnerable to the aggregation error. The purpose of this paper is to consider the regional characteristics by adopting the parameters fitted to each area, so as to reduce prediction errors and enhance accuracy of the resulting mode choice model. In order to estimate parameter of each area, this study used Household Travel Survey Data of Metropolitan Transportation Authority. For the verification of the model, the value of time by marginal rate of substitution is evaluated and statistical test for resulting coefficients is also carried out. In order to crosscheck the applicability and reliability of the model, changes in mode choice are analyzed when Seoul subway line 9 is newly opened and the results are compared with those from the existing model developed without considering the regional characteristics.
A Study on the Active Transit Signal Priority Control Algorithm based on Bus Demand using UTIS
Hong, Gyeong-Sik ; Jeong, Jun-Ha ; An, Gye-Hyeong ; Lee, Yeong-In ;
Journal of Korean Society of Transportation, volume 29, issue 6, 2011, Pages 107~116
In this paper, we implement an algorithm of transit signal priority control that not only maximizes service quality and efficiency of bus, but also minimizes the control delay of passenger cars using UTIS currently being deployed and operated in Seoul national capital area. For this purpose, we propose an algorithm that coordinates the strength of TSP by estimating bus demand. Typically, the higher the strength of TSP is on main street, the bigger the control delay is on the cross street. Motivated by this practical difficulty, we proposes an algorithm that coordinates TSP's strength by checking the degree of saturation of cross street. Also, we verify the possibility of field implementation via simulation analysis using CORSIM RTE based HILS (Hardware In the Loop Simulation). The result shows that travel time of bus improves about 10 percent without increasing control delay of passenger cars by TSP. We expect the result of this research to contribute to increasing the overall transit ridership in this country.
Variable Emission Factor Prediction Model for An Air Quality Assessment of Transportation Projects
Lee, Gyu-Jin ; Choe, Gi-Ju ; Yu, Jeong-Hun ; O, Se-Chang ;
Journal of Korean Society of Transportation, volume 29, issue 6, 2011, Pages 117~128
In this study, a model is developed to predict emission factors, which aims to objectively evaluate the impact of transport projects on air quality. Two emission prediction models for the years of 2015 and 2030 are developed using the historical trends in vehicle aging and vehicle deterioration factors. The analysis results show that the emission factors under the operating speed of 30km/h for the year 2030 are 5~37% and 2~83% less than those used in the current studies for passenger cars and bus/trucks, respectively. The statistically validated experiment results demonstrate the applicability of the proposed model to evaluation of the impact of transport policies on air quality.
Design of VMS Fuzzy Feedback Controller for VMS Routing Information
Park, Eun-Mi ; O, Hyeon-Seon ; Yang, Tae-Gyu ;
Journal of Korean Society of Transportation, volume 29, issue 6, 2011, Pages 129~136
Variable Message Signs have been used for providing information on the current traffic conditions. However, it is considered more important to achieve optimal traffic allocation among the alternative routes by strategic VMS information provision. Fuzzy control is very effective and efficient to deal with such systems that are too complex and uncertain to build mathematical models. In this paper, a fuzzy feedback controller for VMS is proposed, whose goal is to achieve the travel time equilibrium between the two alternative routes. The performance of the suggested controller is implemented and examined using MATLAB/Simulink. More robust controller applicable to a real highway network is suggested for the further research.