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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 24, Issue 7 - Dec 2006
Volume 24, Issue 6 - Oct 2006
Volume 24, Issue 5 - Aug 2006
Volume 24, Issue 4 - Jun 2006
Volume 24, Issue 3 - May 2006
Volume 24, Issue 2 - Apr 2006
Volume 24, Issue 1 - Feb 2006
Selecting the target year
Relation between Highway Improvement and Induced Travel Demand, and Estimate the Demand Elasticity (A Seoul Metropolitan Area Case)
Lee, Gyu-Jin ; Choe, Gi-Ju ; Sim, Sang-U ; Kim, Sang-Su ;
Journal of Korean Society of Transportation, volume 24, issue 4, 2006, Pages 7~17
The purpose or this paper is to investigate the relationship between highway improvement and Induced Travel Demand(ITD) focusing on the Seoul metropolitan area data. In addition, authors tried to estimate basic unit of demand elasticity focusing on zone and trip purpose which can be applied for the ITD forecasting. The results are based on the 2002 Metropolitan Household Transportation Survey Data, where the demand elasticity (DE) is -0.582 in Seoul, -0.597 in Incheon and -0.559 in Gyounggi province, respectively. This study revealed part of the relationship between highway improvement and ITD for metropolitan region and provided the framework for yielding real estimated values by applying the concept of demand elasticity in terms of the relationship by using regional and long-term data. We expect that the basic unit of demand elasticity focusing on zone and trip purpose can be applied for the ITD forecasting to analyze the whole demand exactly The estimated DE's for age group and day of week can also be used for Proper transportation management and transport Policy making. Some limitations have also been discussed.
A Consideration on Connecting Operations among Freeway Management Companies
Lee, Gi-Yeong ; Kim, Dong-Nyeong ; Son, Ui-Yeong ; Lee, Cheong-Won ;
Journal of Korean Society of Transportation, volume 24, issue 4, 2006, Pages 19~29
As the rapid increase of highway investments from Private sector the organizations of highway operator became diversified, and thus causing various unexpected problems. Highways invested by private capitals have different fare rates and managing systems. It is desirable to reduce drivers' inconvenience using more than two sections of highways spread over different jurisdictions. The main purposes of this research are i) data survey and problem statements ii) prediction of future problems and preparing appropriate countermeasures. This research are divided into two parts. They are management system and fare collection system. Major investigations of this study are as follows, optimum toll operation models depend on charging systems and interchange shapes of two interconnecting expressways. Assuming that the current payment and the new electronic payment system aye used concurrently for a while, some alternatives for the inter-operation to collect tolls ate suggested focusing on the efficiency to tollway corporations as well as convenience to drivers. The advantages and disadvantages of the alternatives, including their characteristics, are compared.
Comparing the Effectiveness of Road Safety Features by Spatial Scope of Safety Improvement Project
Park, Gyu-Yeong ; Kim, Tae-Hui ; Kim, Seong-Uk ; Lee, Su-Beom ;
Journal of Korean Society of Transportation, volume 24, issue 4, 2006, Pages 31~42
The purpose of this study is to compare the effectiveness of road safety features by spatial scope Spot & Section-based safety Improvement project. Empirical data was collected from black-spot study of Jeonbuk and "Traffic Safety Improvement Project on National Highway 17". Evaluation model of effectiveness was developed by using Empirical Bayes (EB) method. And Relative Effectiveness was measured by Odds Ratio. The result indicates that Section-based safety improvement was
more effective than the spot-based. It means that section-based improvement projects should be expanded while considering the characteristics of the section in spot based improvement.
An Analysis of Pedestrians' Speed according to Pedestrian Countdown Signal Systems
Jang, Myeong-Sun ; Im, Sam-Jin ; Kim, Gyeong-Hui ;
Journal of Korean Society of Transportation, volume 24, issue 4, 2006, Pages 43~53
Pedestrian countdown signals were newly introduced to make Pedestrians feel more comfortable and safer in crossing the streets This Paper analysed pedestrian walking-speed through a before-after behavior study Data was collected from 22 sites. and the total number of pedestrians was 19,800. The results showed that the average Pedestrian walking-speed of existing pedestrian signal, an inverted triangle countdown signal and a numeric countdown signal were 1.44, 1.39 and 1.42m/sec. The difference between the three methods was statistically significant. The results showed that the distribution of the walking-speed of existing signal. an inverted triangle countdown signal and a numeric countdown signal were statistically Erlang(0.117, 10) distribution. Weibull(1.17, 3.72) distribution and Gamma(0.137, 8.18) distribution at 95% confidence level.
Estimating the Effectiveness of Road Safety Features using Pedestrian Accident Probability Model
Park, Gyu-Yeong ; Lee, Su-Beom ;
Journal of Korean Society of Transportation, volume 24, issue 4, 2006, Pages 55~65
The ratio of Pedestrians in traffic accident fatality takes up 43% in Korea, which is 2.5 times as much as OECD's average. The traffic accidents features by road type shows that the fatality of the national highway posts the highest due to the accidents of pedestrians. Accordingly, the establishment of safety facilities for pedestrians is expected to increase on the rural roads for the prevention of pedestrian accidents. However, studies on pedestrians have been mainly focused on urban intersections. In Particular, studies on estimating the effectiveness of safety features for pedestrians are very poor. Thus, in this study. the Pedestrian accident probability model on four lane national highway was developed by using logit model. Also, this study analyzed and proposed the effect of facilities as a relative risk by using an odds ratio. As a result of the analysis, the Improvement of sight distance, installing sidewalks and lightings were proven effective alternatives for reducing the pedestrian accidents.
Evaluation of Rail Parcel Service and Policy Recommendations
Mun, Jin-Su ; Jeon, Il-Su ; Kim, Min-Yeong ;
Journal of Korean Society of Transportation, volume 24, issue 4, 2006, Pages 67~79
The carriage of the Parcel by vail has declined sharply in recent decade due to the advent of parcel service by truck in the early 1990s. As a result, rail stations Providing the parcel services have decreased from 421 stations in the year 1973, to only 90 stations in 2005. From the financial perspective, the Parcel consignment expenses has surpassed the revenue, recording 5.2 billion Won of yearly deficit from the year 1999 to 2003. The shift in the train operators' affiliation from a governmental department to a government-funded organization arose due to the vail reform in January 1, 2005, and the train operators have sought to abolish the parcel services to minimize the deficit. In this research. we investigated the problems of rail parcel services, their competitiveness compared to the road parcel services, and their revitalization Possibilities. Finally. we have proposed plans for the abolishment of the rail parcel services, and assessed the possible outcome or this abolishment.
A Comparison of Public Transportation Competitiveness in World Major Cities
Kim, Dong-Jun ; Kim, Hye-Ja ; Jang, Won-Jae ; Seong, Hyeon-Gon ;
Journal of Korean Society of Transportation, volume 24, issue 4, 2006, Pages 81~91
As public transportation is significant mode to make sustainable urban transportation system, the importance of Public transportation has grown gradually. Nowadays the central and local government make various policies which help to raise modal sp)it of public transportation. To understand previous public transportation Policies and make more efficient policies, it is important to know the current level of public transportation exactly. The main aim of this study is assess the competitiveness of public transportation in world major cities We select assessment indexes and have grouping use factor analysis. Then we have 8 clusters of cities by cluster analysis, Also, we analyze the relationship between public transportation characteristics and modal split
Study of Effectiveness of Signal Preemption Strategy using VISSIM
Jo, Han-Seon ; O, Ju-Taek ; Lee, Jae-Myeong ; Park, Dong-Ju ;
Journal of Korean Society of Transportation, volume 24, issue 4, 2006, Pages 93~101
The signalized intersections near highway-railroad grade crossing are operated without signal preemption in Korea when trains are approaching the crossing. This signal operation is very dangerous because queues from the intersection can extend back over the track, thereby creating the Potential for a serious vehicle-train accident. And the queues from the crossing can extend to the intersection with the normal signal operation while trains Pass the crossing. In this case the intersection is disrupted, and delay and the Potential for vehicle accident increase highly In order to improve the intersection performance and Protect the accident the crossings and intersections. signal Preemption designed to provide a special control mode should be implemented. In this study it was shown that intersection Performance near highway-railroad grade crossing improved using signal preemption. When signal Preemption is implemented at the test site, the delay was reduced by about 9sec/veh. Even though there were vehicle-train accidents at the crossing in all 30 simulations without signal preemption. there was no vehicle-train accidents at all when signal preemption is used.
Freight Market Segmentation Using Company Size and Shipment Characteristics Data
Choe, Chang-Ho ; Nam, Du-Hui ;
Journal of Korean Society of Transportation, volume 24, issue 4, 2006, Pages 103~113
Market Segmentation for Freight Transportation has been used to know the strategies both efficiency of freight transportation market and attraction of freight volume for carriers. It was so difficult to understand the individual preference of shippers that all shippers could be only homogenized through market segmentation. In Korea. standard Industrial classification has been used for freight market segmentation. This study evaluated another new market segmentation method for manufacturing industry. From the study, we knew that the best relevant market segmentation criterion was annual input-output volume, which showed excellent segmenting ability. Also. the results showed many differences against segmentation results according to standard industrial classification. This study had a meaning as a new trial which segmented freight transportation market using company size and shipment characteristic data.
Systematic Error Term Analysis on Bus Arrival Time Estimation
Kim, Seung-Il ; Kim, Yeong-Chan ; Lee, Cheong-Won ;
Journal of Korean Society of Transportation, volume 24, issue 4, 2006, Pages 117~127
Many large cities in Korea have implemented or planed to implement a bus information system(BIS) to improve service quality for bus Passengers, mainly by Providing bus arrival time at bus stations. In those systems, similar systematic errors to estimate the bus arrival time occur, which are caused by the cycle time to identify each bus location, the information processing time of the center system, and the cycle time to update the bus arrival information on each terminal. This paper investigated each cause sequentially and estimated three expectations related to the above three causes, respectively using the random incidence concept. Through a validation using real data from a BIS in a city in Korea, fairly amount of improvements on the bus arrival time estimation have been observed
Development of Capacity Analysis Procedure for Freeway Facility System
Lee, Seung-Jun ;
Journal of Korean Society of Transportation, volume 24, issue 4, 2006, Pages 129~148
The objective of this thesis is to develop a capacity analysis and to develop a methodology to evaluate Level of Service over the entire freeway sections by single MOE (Measure of Effectiveness) This study set forth from a following viewpoint. to analyze entire freeway sections as freeway facility system, it is important to identify the exact point where congestion would occur and the extent of the congestion. Therefore, in this thesis, congestion mechanism on freeways was figured out and congestion analysis methodology was developed. Thereby maximum possible throughput rate and maximum throughput rate in bottleneck sections were calculated and a congestion analysis was carried out. The difference between the new method and existing Procedures is that maximum possible throughput rate and maximum throughput rate. that can be considered as capacities of un-congested and congested flow in the bottleneck section, are variable capacities dependent on demand flow
Solution Methods for OD Trip Estimation in Stochastic Assignment
Im, Yong-Taek ;
Journal of Korean Society of Transportation, volume 24, issue 4, 2006, Pages 149~159
Traditional trip tables are estimated through large-scale surveys such as household survey, roadside interviews, and license Plate matching. These methods are, however, expensive and time consuming. This paper presents two origin-destination (OD) trip matrix estimation methods from link traffic counts in stochastic assignment, which contains perceived errors of drivers for alternatives. The methods are formulated based on the relation between link flows and OD demands in logit formula. The first method can be expressed to minimize the difference between observed link flows and estimated flows, derived from traffic assignment and be solved by gradient method. The second method can be formulated based on dynamic process, which nay describe the daily movement patterns of drivers and be solved by a recursive equation. A numerical example is used for assessing the methods, and shows the performances and properties of the models.