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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 30, Issue 6 - Dec 2012
Volume 30, Issue 5 - Oct 2012
Volume 30, Issue 4 - Aug 2012
Volume 30, Issue 3 - Jun 2012
Volume 30, Issue 2 - Apr 2012
Volume 30, Issue 1 - Feb 2012
Selecting the target year
Simultaneous Equation Models for Evaluating Roundabout Accidents According to Different Driving Types
Kim, Kyung Hwan ; Park, Byung Ho ;
Journal of Korean Society of Transportation, volume 30, issue 5, 2012, Pages 3~10
DOI : 10.7470/jkst.2012.30.5.003
This study dealt with traffic accidents occurring within roundabouts. The objective was to develop roundabout accident models for different driving types by using simultaneous equations. In pursuing the above, this study used a statistical program SPSS 17.0 to accommodate data from 148 accidents occurred within 39 roundabouts of Korea. In addition, the 2SLS(2 stage least square) estimation method was adopted to calibrate the models. The main results are as follows. First, both the number of accidents and the EPDO were evaluated to have bilateral relationships. Second, all 6 different simultaneous equation models according to driving types were found to be statistically significant. Third, the developed models were compared to each other with respect to either common or specific variables. Finally, variables such as ADT, conflicting rate, heavy vehicle ratio, circulatory roadway width, number of circulatory roadway lane, approach lane width, average approach lanes, parking places, and bus stops were selected as independent variables for the models.
The Optimal Location and Specification of Sub-destination Sign in a Roundabout
Chong, Kyu Soo ; Woo, Je Yoon ;
Journal of Korean Society of Transportation, volume 30, issue 5, 2012, Pages 11~21
DOI : 10.7470/jkst.2012.30.5.011
As a strategy to enhance traffic management, roundabouts come to the fore recently to decrease traffic accidents, streamline traffic flows, and expedite the realization of green transportation. As local governments introduced roundabouts, new road sign standards have to be established because the existing road sign regulations cannot be applied to roundabouts. Prior to trying to make suitable specification of sub-destination signs in roundabouts, regulations of other countries were examined and modified. The legend and location was calculated so that drivers could turn in time. Two specifications were determined by simulation experiments. As a result, drivers could read signs at right side better than at traffic island, and turn in time at 15cm legend size. Consequently, we proposed the minimum specifications and optimal locations of sub-destination signs.
Design Criteria of Traffic Island Considering Pedestrian LOS
Park, Byung Ho ; Beak, Tae Hun ; Jung, Yong Il ;
Journal of Korean Society of Transportation, volume 30, issue 5, 2012, Pages 23~31
DOI : 10.7470/jkst.2012.30.5.023
The objective of this study is to develop the design criteria of traffic island considering pedestrian level of service (LOS). In pursuing the above, this study gives particular emphasis to suggesting the minimum design space of traffic island in order to maintain pedestrian LOS C and D, and the critical pedestrian traffic volume that reflects the intersection geometry (2 lanes per direction) through the simulation analysis. The main results are as follows. First, the spaces of 160 traffic islands, which meet the pedestrian LOS C and D and reflects the pedestrian traffic volume by signal cycle, are drawn by using a commercial simulator VISSIM. The relevant spaces of traffic island in terms of both the pedestrian LOS and the pedestrian traffic volume are evaluated to range from
. Second, the critical pedestrian traffic volume for the operation of traffic island is evaluated to be 1,000-1,300 person/hour at LOS C and 1,600-1,800 person/hour at LOS D, respectively, when a cycle of 120-150 seconds were applied to a intersection with two lanes per direction.
A Model for Estimating Social Cost of Mobile Emission Considering Geographical and Social Characteristics
Lee, Kyu Jin ; Choi, Keechoo ;
Journal of Korean Society of Transportation, volume 30, issue 5, 2012, Pages 33~42
DOI : 10.7470/jkst.2012.30.5.033
This study proposed a model for estimating the unit value of social cost for mobile emission considering local geographical and social characteristics, together with a method to evaluate the air quality value. The model was built based on benefit transfer methods, the population density, and green space ratio of each area, which are reflected through independent variables. While applying the model, the unit value of social cost for mobile emissions in both densely populated areas of Seoul and Busan was found to be 18.68 times and 10.71 times higher than the national average, respectively. It is highly expected that this study can contribute to providing more reliable guidelines to decision makers when evaluating various green transportation policies and projects.
A Study on Trip Distribution Estimation Model's Accuracy: Using Daegu City O-D Tables
Ryu, Yeong-Geun ; Woo, Yong Han ;
Journal of Korean Society of Transportation, volume 30, issue 5, 2012, Pages 43~59
DOI : 10.7470/jkst.2012.30.5.043
It is generally assumed about trip distribution estimation model that growth factor model's estimation accuracy is higher than that of other models in short-term and that gravity model's estimation accuracy is higher than that of other models in long-term. For validation of such assumptions, this study compares estimation accuracies of each estimation model using 3year(1988, 1992, 2004) O-D tables from Daegu city. Each estimation model's accuracy were compared by mid-size and large-size zone as well as short-term and long-term target years. The results show that the trip distribution estimation model selection by usual assumption is not always right.
The Measurement of Road Alignment Using GPS-IMU System
Park, Jae-Hong ; Yun, Duk-Geun ; Sung, Jung-Gon ; Lee, Jun-Seok ;
Journal of Korean Society of Transportation, volume 30, issue 5, 2012, Pages 61~69
DOI : 10.7470/jkst.2012.30.5.061
It is important for highway maintenance and safety assessment to get the accurate highway geometric information. However, it is difficult to acquire good highway geometric information due to missing blueprints or deteriorated highway sections. This research, to get highway geometric information rapidly, has developed a highway geometric analysis algorithm that uses data from vehicles with GPS-IMU integrated system. In conclusion, the result shows that 3.38% of error-ratio for the horizontal alignment and 0.083 absolute value difference for vertical grade comparing with highway drawings. Therefore, the result suggest that the developed method can be applied to the road safety inspection or road safety audit.
Calibration of a Network Link Travel Cost Function with the Harmony Search Algorithm
Kim, Hyun Myung ; Hwang, Yong Hwan ; Yang, In Chul ;
Journal of Korean Society of Transportation, volume 30, issue 5, 2012, Pages 71~82
DOI : 10.7470/jkst.2012.30.5.071
Some previous studies adopted a method statistically based on the observed traffic volumes and travel times to estimate the parameters. Others tried to find an optimal set of parameters to minimize the gap between the observed and estimated traffic volumes using, for instance, a combined optimization model with a traffic assignment model. The latter is frequently used in a large-scale network that has a capability to find a set of optimal parameter values, but its appropriateness has never been demonstrated. Thus, we developed a methodology to estimate a set of parameter values of BPR(Bureau of Public Road) function using Harmony Search (HS) method. HS was developed in early 2000, and is a global search method proven to be superior to other global search methods (e.g. Genetic Algorithm or Tabu search). However, it has rarely been adopted in transportation research arena yet. The HS based transportation network calibration algorithm developed in this study is tested using a grid network, and its outcomes are compared to those from incremental method (Incre) and Golden Section (GS) method. It is found that the HS algorithm outperforms Incre and GS for copying the given observed link traffic counts, and it is also pointed out that the popular optimal network calibration techniques based on an objective function of traffic volume replication are lacking the capability to find appropriate free flow travel speed and
A Study on Acceleration of Transient Brake Section and Skidding Section
Kim, Kil Bae ; Jung, Woo Teak ; Ryu, Tae Sun ; Oh, Young Tae ;
Journal of Korean Society of Transportation, volume 30, issue 5, 2012, Pages 83~90
DOI : 10.7470/jkst.2012.30.5.083
Driver ordinarily takes sudden braking when urgent situation is developed or when the vehicle is involved in an unexpected accident. Therefore, the most common trace at a traffic accident scene is skid mark. Currently, in investigating traffic accident, overspeed is determined by the length of skid mark. However, in order to identify accurate cause of accident, estimation of pre-braking speed which takes into account speed reduction during transient time should be considered as a requirement. In a recent study, several ways to estimate pre-braking speed were suggested, but none considered to differentiate the decelerating transient brake section and skidding section. This study analyzed trends of decelerating transient brake section and skidding section by real braking test.
A Study on the Development of Marine Traffic Risk Model for Mariners
Heo, Tae-Young ; Park, Young-Soo ; Kim, Jong-Sung ;
Journal of Korean Society of Transportation, volume 30, issue 5, 2012, Pages 91~100
DOI : 10.7470/jkst.2012.30.5.091
Although Korea's coastal areas increasingly experience marine accident due to frequent ship encounters, increased vessel traffic and large vessel, there is a no specific model to evaluate the navigating vessel's risk for the given situation. The maritime transport environmental assessment is necessary due to the amended marine traffic law. However, marine safety diagnosis is now evaluated by foreign models. In this paper, therefore, we suggest a domestic model catering to and reflecting the characteristics of Korea's costal areas as well as those of vessel navigator's risk. We can evaluate subjective risks using this model, and can establish the model output as maritime risk exposure assessment system. We have performed analyses of variance and multiple comparison to identify the factor affecting subjective risks. As a result, measurable subjective risks of maritime traffic accident based on our suggested model can be expressed using the maritime risk exposure assessment system with geographic information system.