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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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Korean Society of Transportation
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Volume & Issues
Volume 19, Issue 6 - Dec 2001
Volume 19, Issue 5 - Oct 2001
Volume 19, Issue 4 - Aug 2001
Volume 19, Issue 3 - Jun 2001
Volume 19, Issue 2 - Apr 2001
Volume 19, Issue 1 - Feb 2001
Selecting the target year
A New Proposal of Pedestrian Signal Time
Journal of Korean Society of Transportation, volume 19, issue 3, 2001, Pages 7~18
The pedestrian signal systems operating presently could provide more time for the pedestrian to cross the street than the previous system, but it would increase the cycle length and cause longer delays at the signalized intersections. For instance, more than 80% of traffic signals would have to have the cycle length increased by 10sec in Daegu Metropolitan areas. Therefore. the purpose of this study is to propose a pedestrian traffic signal time that not only maintains the safety of the pedestrian but also reduces the traffic cycle length. The proposed pedestrian signal time is set to enable enough time for the elderly to cross and the flashing time is set low enough to deter the ordinary person. This new pedestrian signal time can reduce the traffic cycle length at intersections and prevent the Pedestrian crossing during flashing time. In addition to the flashing green should be changed to flashing red to warn the pedestrian he should not begin crossing as opposed to the flashing green which suggest he could cross. In this study, the speed of 1.1m/sec and 0.85m/sec are applied to the new proposed signal time for normal and elderly person respectively after analyzing data collected at Daegu Metropolitan area.
A Study on the Parking Place Choice Behaviors Using Stated Preference Data (the case of shopping trips)
Journal of Korean Society of Transportation, volume 19, issue 3, 2001, Pages 19~32
A parking facility choice model. which can be applied to analyze of the driver's parking behavioral changes in response to the local government's parking policy changes and to predict parking demand by the facility types, is developed. Under the context of the stated preference discrete choice model, socioeconomic variables and parking alternative characteristic variables are introduced as explanatory variables. A parking facility choice model for the shopping trip purpose is derived using multinomial logit model and nested logit model and the stated preference data collected in Taegu metropolitan area. The result shows that the sign of all the estimated parameters are logically consistent and the model's goodness of fit is reasonably good. As a result of the elasticity analysis of the model, the elasticity of parking cost is highest, and the elasticity of walking distance between parking place and the destination is higher than parking place searching and ingress time. This means that the parking places are supplied around the destination in the form of small-size parking place. The findings in this study is expected to provide a fundamental data for various short-term parking policy analyses and for parking facility's demand estimations.
How to Charge Equitably on Free-of-Charge Urban Freeways
Journal of Korean Society of Transportation, volume 19, issue 3, 2001, Pages 33~43
The Purpose of this study is to find the most appropriate pricing method on urban freeways. The study consists or two parts : 1) developing pricing strategies focused on equity issues. 2) a case study. As the case study site, Seoul section of Kyungbu expressway is selected, and the four pricing alternatives such as Fare Lane, HOT lane. ERP, maintenance cost recovery are tested. The study results show that 1) the most equitable pricing method is to internalize congestion costs rather than to recover maintenance costs, 2) all passenger vehicles except buses be levied the charge. 3) the fare level be set for maximizing the efficiency of freeway capacity, 4) lanes be divided by two types. charged and freed, and 5) the revenue be spent either for improving the qualify of buses or be returned to the freeway users who will determine the ways of maximizing their utilities using the money. In conclusion, we need further studies to put pricing on urban freeway into practice. They include site selection. analysis methods. and related laws.
Comparative Study of Subjective Mental Workload Assessment Techniques for the Evaluation of ITS-oriented Human-Machine Interface Systems
Cha, Doo-Won ; Park, Peom ;
Journal of Korean Society of Transportation, volume 19, issue 3, 2001, Pages 45~58
Subjective mental workload assessment technique becomes a standard human factors and human-machine interface evaluation tool for the evaluation of ITS(Intelligent Transport Systems)-oriented information systems as well as the drivers visual activity analysis, physiological indices(GSR, EEG, ECG, etc.), secondary task performance, reaction time. vehicle control parameters(speed, steering behavior, accelerator control) that are widely applied for transportation and vehicle systems to evaluate the safety, to decide the system or design alternatives, and to establish the design guidelines. This paper reviewed and compared the most globally employed four mental workload assessment techniques that have been designed for the use of various human-machine systems and ITS-oriented in-vehicle information systems. NASA-TLX(National Aeronautics and Space Administration-Task Load Index). SWAT(Subjective Workload Assessment Technique), MCH(Modified Cooper-Harper) scale, and recently developed RNASA-TLX(Revision of NASA-TH) were compared in terms of sensitivity and subjective evaluations to derive the human-machine interface evaluation guidelines for the application of ITS-oriented in-vehicle information systems. Then, experiment results supported that RNASA-TLX is the prospective tool for the mental workload assessment of ITS-oriented in-vehicle information systems.
Research on The Modeling of Appropriate Parking Space for Mass Traffic Generating Facilities
Journal of Korean Society of Transportation, volume 19, issue 3, 2001, Pages 61~73
The purpose of this study is to simulate the suitable space of parking lots for Mass traffic instigating facilities in Pusan. After the suitable scale of parking lots estimate using GPSS, one of the Queue Simulation, with the average arriving time and the average parking time at parking lots, the formula is simulated by the Regression model to relate a total floor area and the suitable number of parking lots. The improved criteria or present parking lots is needed to prevent the unnecessary vehicles and improve the efficiency of land use. The suitable scale of parking lots estimate just with the state of using the parking lots in this study. but it is necessary to consider land use, traffic condition, commercial area etc.
Signal Optimization Model Reflecting Alternative Use of Lanes for Left/Through Traffic at A Signalized Intersection
Journal of Korean Society of Transportation, volume 19, issue 3, 2001, Pages 75~88
Signal optimization model for alternative use of lanes at a signalized intersection with an stop-line added backward was presented in this paper. The simulation results shot-ed that the traffic fed from the stop-line passed the intersection in each specified phasing interval for left and through traffic. The experimental results indicated that the proposed model was much superior to traditional signal optimization methodology in reducing delay, fuel consumption, and disutility index for delay and stops. The effects for reducing delay were greater than those for doing fuel consumption and disutility index due to the added stop-line. The proposed model is expected to alleviate traffic congestion at intersections, both which have no left turn pocket, and which have large left turn volume. The model is recommended to adapted for intersections spaced long among them with no near driveway.
Development of Exit-Ramp Control Strategy Avoiding Mainline Spillover for Urban Freeway
Journal of Korean Society of Transportation, volume 19, issue 3, 2001, Pages 89~100
Traffic control strategy for heavily congested exit ramps in urban freeway, especially for Ring-Road in Seoul. was presented in this paper. New concept of traffic signal control was prepared for the traffic signals engaged in the exit ramp and the vicinity area. Traffic signal control methodology for over-saturated traffic conditions such as equity offset and imbalanced splits was applied. The exit ramp suffering from serious traffic congestion was selected for the test of the proposed control strategy. After simulation triaffic, it was found that the control strategy was effective in preventing main-line queue spill-back, and managing queue lengths between the exit ramp traffic and the adjacent street traffic. The exit-ramp control system is under construction now. This system will start operation in Summer, 2001. Authors will conduct the field operation and monitor the system performance.
Path-based Dynamic User Equilibrium Assignment Model using Simulation Loading Method
Journal of Korean Society of Transportation, volume 19, issue 3, 2001, Pages 101~113
Since late 1970s. one of the principal research areas in transportation problem is dynamic traffic assignment (DTA). Although many models have been developed regarding DTA, yet they have some limits of describing real traffic patterns. This reason comes from the fact that DTA model has the time varying constraints such as state equation, flow propagation constraint, first in first out(FIFO) rule and queuing evolution. Thus, DTA model should be designed to satisfy these constraints as well as dynamic route choice condition, dynamic user equilibrium. In this respect, link-based DTA models have difficulty in satisfying such constraints because they have to satisfy the constraints for each link, while path-based DTA models may easily satisfy them. In this paper we develop a path-based DTA model. The model includes point queue theory to describe the queue evolution and simulation loading method for depicting traffic patterns in more detail. From a numerical test, the model shows promising results.
A Path-based Traffic Flow Simulation Model for Large Scale Network
Journal of Korean Society of Transportation, volume 19, issue 3, 2001, Pages 115~131
The Purpose of this study is to develop a simulation model for large-scale network with interrupted flow as well as uninterrupted flow. The Cell Transmission(CT) theory is used to simulate traffic flow. Flow transition rules have been newly developed to simulate traffic flows at merging and diverging sections, and signalized intersections. In the model, it is assumed that dynamic OD table is exogenously given. Simulation results for toy network shows that the model can explain queue dynamics not only in signalized intersections of urban arterials, but also in merging and diverging sections of freeway. In case study, the model successfully simulated traffic flows of 145,000 vehicles on CBD network of city of Seoul with 74 traffic zones, 133 signalized intersections among 395 nodes and 1110 links.
A Traffic Flow Micro-simulation System Using Cellular Automata
Journal of Korean Society of Transportation, volume 19, issue 3, 2001, Pages 133~144
The purpose of this study is to develop micro simulation model for large-scale network with driver's behavior model. This study is performed for uninterrupted flow road section. And this model is developed to simulate traffic flow of the real network with unique geometric structure. The vehicle transmission and drivers' behavior model based on the exiting Cellular Automata approach.
Modifying Vehicle Classification Categories for Enhancing Utilization of Traffic Volume by Vehicle types
Journal of Korean Society of Transportation, volume 19, issue 3, 2001, Pages 153~165
OD Matrix Estimation from Traffic Counts Using Genetic Algorithm
Journal of Korean Society of Transportation, volume 19, issue 3, 2001, Pages 169~170