Pub Date : 2020-08-31DOI: 10.7470/jkst.2020.38.4.265
A. Jung, Jieun Ko, C. Oh
Elderly drivers have rapidly grown in the road transportation systems. One of the significant issues associated with elderly drivers is that the performance of perception and reaction contributing to the driving skill and capability is comparatively lower than that of drivers of different ages. In particular, the merging situations frequently occurring at the freeway on-ramp area lead to greater workload for elderly drivers and resultingly higher risk of crash occurrence. From the traffic safety perspective, determining proper acceleration lane length, therefore, is of keen interest because the physical ability of elderly drivers significantly influences whether or not the lane change is safe. This study evaluated acceleration lane length using VISSIM microscopic traffic simulation tool based on the consideration of the increase in elderly drivers. Results showed that approximately 370 meter length is proper in terms of accommodating unsafe merging events at the current rate of elderly drivers, 10%. In addition, it was identified that 415 meter was appropriate under a scenario with 20% of elderly drivers. The outcome of this study would be useful in updating road design guidelines reflecting the characteristics of elderly drivers.
{"title":"Evaluation of Freeway Acceleration Lane Length Adequacy Based on Driving Behavior of Elderly Drivers","authors":"A. Jung, Jieun Ko, C. Oh","doi":"10.7470/jkst.2020.38.4.265","DOIUrl":"https://doi.org/10.7470/jkst.2020.38.4.265","url":null,"abstract":"Elderly drivers have rapidly grown in the road transportation systems. One of the significant issues associated with elderly drivers is that the performance of perception and reaction contributing to the driving skill and capability is comparatively lower than that of drivers of different ages. In particular, the merging situations frequently occurring at the freeway on-ramp area lead to greater workload for elderly drivers and resultingly higher risk of crash occurrence. From the traffic safety perspective, determining proper acceleration lane length, therefore, is of keen interest because the physical ability of elderly drivers significantly influences whether or not the lane change is safe. This study evaluated acceleration lane length using VISSIM microscopic traffic simulation tool based on the consideration of the increase in elderly drivers. Results showed that approximately 370 meter length is proper in terms of accommodating unsafe merging events at the current rate of elderly drivers, 10%. In addition, it was identified that 415 meter was appropriate under a scenario with 20% of elderly drivers. The outcome of this study would be useful in updating road design guidelines reflecting the characteristics of elderly drivers.","PeriodicalId":146954,"journal":{"name":"Journal of the Eastern Asia Society for Transportation Studies","volume":"44 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113991474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.7470/jkst.2020.38.3.232
Han Da Jeong, Kim Eung-Cheol, Ji， Mingyeong
PM (Personal Mobility) is a new type of transportation mode, and the number of users is increasing rapidly due to convenience and portability. However, related research is insufficient and PM safety issues are constantly occurring. In this study, we analyzed the severity of PM accidents and analyzed PM accidents that occurred in 2017 and 2018. PM accidents were classified into four stages according to the severity of accidents. Factors affecting accidents were classified into road and environmental factors, accident type factors and human factors. And factors that significantly affected PM accidents were selected. As a result of the analysis, significant variables influencing the severity of PM accident were selected. Among the roads and environmental factors, May or the time zone at 14 and 21, 23 were found to be high in the severity of PM accidents. And when the road was wet or the accidents occurred at intersections of roads were found to be high in severity of PM accidents. If PM other driver’s age was 50s, 60s or 70s, the accident severity was also found to be high. In the case of the PM and other vehicle’s accidents, the severity of accidents was high when the other vehicle was bicycle and the driver’s age was 40s, 50s. In the case of the PM and pedestrian’s accidents, the severity was also high when the accident occurred at the sidewalk or during crossing the intersection. In case of PM-only accident, when the accident site was other place (except for crossroads, single lanes, bridges, tunnels, and parking lots), the severity was high.
{"title":"Analysis of Severity Factors in Personal Mobility (PM) Traffic Accidents","authors":"Han Da Jeong, Kim Eung-Cheol, Ji， Mingyeong","doi":"10.7470/jkst.2020.38.3.232","DOIUrl":"https://doi.org/10.7470/jkst.2020.38.3.232","url":null,"abstract":"PM (Personal Mobility) is a new type of transportation mode, and the number of users is increasing rapidly due to convenience and portability. However, related research is insufficient and PM safety issues are constantly occurring. In this study, we analyzed the severity of PM accidents and analyzed PM accidents that occurred in 2017 and 2018. PM accidents were classified into four stages according to the severity of accidents. Factors affecting accidents were classified into road and environmental factors, accident type factors and human factors. And factors that significantly affected PM accidents were selected. As a result of the analysis, significant variables influencing the severity of PM accident were selected. Among the roads and environmental factors, May or the time zone at 14 and 21, 23 were found to be high in the severity of PM accidents. And when the road was wet or the accidents occurred at intersections of roads were found to be high in severity of PM accidents. If PM other driver’s age was 50s, 60s or 70s, the accident severity was also found to be high. In the case of the PM and other vehicle’s accidents, the severity of accidents was high when the other vehicle was bicycle and the driver’s age was 40s, 50s. In the case of the PM and pedestrian’s accidents, the severity was also high when the accident occurred at the sidewalk or during crossing the intersection. In case of PM-only accident, when the accident site was other place (except for crossroads, single lanes, bridges, tunnels, and parking lots), the severity was high.","PeriodicalId":146954,"journal":{"name":"Journal of the Eastern Asia Society for Transportation Studies","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123658583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.7470/jkst.2020.38.3.190
Kyung-Chang Min, H. Ha
Since the WTO was launched in 1995, Air cargo demand has risen sharply. It is expected to grow further on the explosive growth of E-commerce and Cross-Border trade in recently. As air cargo demand increases, the importance and needs for the forecasting of air cargo demand is increasing as well. Most of previous researches has been focussed on passenger part. In the case of researches on the forecasting of air cargo demand, the majority of researches are conducted quarterly or yearly forecasting to apply for establishment of mid-/long-term strategies, and an investment plan for an airport. The purpose of this paper is to develope the daily air cargo forecasting model that is able to help players in aviation, airlines, airports, etc., establish detailed operational strategies. In this paper, Chi-squared automatic interaction detection methodology is used to develop the forecasting model. The forecasting model is developed through two steps. At the first step, the weekly volume of air cargo is predicted by using CHAID methodology based on predict value from autoregressive integrated moving average and holiday information. At the second step, the final model which is the daily air cargo demand forecasting model is developed based on the weekly forecasting result from the first step, and holiday information by CHAID method as well. Based on the forecasting model developed in this paper, the daily cargo volumes for the next 56 days are predicted and the forecasting accuracy for each day is 93.9% which is 8.6% point higher than the forecasting accuracy for ARIMA model. It was noted that, unlike the characteristics of general demand forecasts, the high forecasting accuracy is maintained regardless of time lag from the forecasting point. And the result of the forecasting by shifting the forecasting point to 20 point, the forecasting accuracy for each dais is 91.2%, is high as well. The research finding shows the forecast model of this paper is worth to use as a daily forecasting model. It is expected that this paper will help to forecast the daily air cargo demand, and will further be used to forecast daily demand in more diverse area.
{"title":"Forecasting the Daily Demand of Air Cargo Using Data Mining with CHAID Approach","authors":"Kyung-Chang Min, H. Ha","doi":"10.7470/jkst.2020.38.3.190","DOIUrl":"https://doi.org/10.7470/jkst.2020.38.3.190","url":null,"abstract":"Since the WTO was launched in 1995, Air cargo demand has risen sharply. It is expected to grow further on the explosive growth of E-commerce and Cross-Border trade in recently. As air cargo demand increases, the importance and needs for the forecasting of air cargo demand is increasing as well. Most of previous researches has been focussed on passenger part. In the case of researches on the forecasting of air cargo demand, the majority of researches are conducted quarterly or yearly forecasting to apply for establishment of mid-/long-term strategies, and an investment plan for an airport. The purpose of this paper is to develope the daily air cargo forecasting model that is able to help players in aviation, airlines, airports, etc., establish detailed operational strategies. In this paper, Chi-squared automatic interaction detection methodology is used to develop the forecasting model. The forecasting model is developed through two steps. At the first step, the weekly volume of air cargo is predicted by using CHAID methodology based on predict value from autoregressive integrated moving average and holiday information. At the second step, the final model which is the daily air cargo demand forecasting model is developed based on the weekly forecasting result from the first step, and holiday information by CHAID method as well. Based on the forecasting model developed in this paper, the daily cargo volumes for the next 56 days are predicted and the forecasting accuracy for each day is 93.9% which is 8.6% point higher than the forecasting accuracy for ARIMA model. It was noted that, unlike the characteristics of general demand forecasts, the high forecasting accuracy is maintained regardless of time lag from the forecasting point. And the result of the forecasting by shifting the forecasting point to 20 point, the forecasting accuracy for each dais is 91.2%, is high as well. The research finding shows the forecast model of this paper is worth to use as a daily forecasting model. It is expected that this paper will help to forecast the daily air cargo demand, and will further be used to forecast daily demand in more diverse area.","PeriodicalId":146954,"journal":{"name":"Journal of the Eastern Asia Society for Transportation Studies","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130207597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.7470/jkst.2020.38.3.176
Minsoo Oh, J. Jang, C. Oh, Keunsoo Han
The aging problem is a significant issue in terms of overall aspects of society, and the need for making traffic safety policies is of keen interest because the increase in elderly drivers may have an impact on traffic safety. Therefore, the primary purpose of this study was to identify the characteristics of elderly drivers’ driving behaviors on freeways and to evaluate the workload of elderly drivers. The driving behavior of subjects was evaluated by utilizing the trajectory data optained from driving simulation experiments. In addition, the workload of subjects was estimated based on the ratio of beta waves to entire brain waves, which were collected while the participants were conducting the driving experiment. As a result, the average of elderly drivers’ speed was lower by 6% than non-elderly drivers. However, the average of the standard deviation of elderly drivers’ speed, which is a measure of effectiveness to represent the longitudinal driving stability, was higher about 25% than non-elderly drivers. Moreover, the average of the standard deviation of the lane position of elderly drivers on freeways, which indicates how they are stable on lateral driving, was higher about 31% compared to non-elderly drivers. Besides, the amount of beta wave of elderly drivers, which shows a driver’s psychological workload, was higher about 11% than non-elderly drivers. This study is expected to be utilized as a fundamental data when policies for elderly drivers are established in order to improve traffic safety in the aging society.
{"title":"Analysis of Driving Behavior and Workload of Elderly Drivers on Freeways","authors":"Minsoo Oh, J. Jang, C. Oh, Keunsoo Han","doi":"10.7470/jkst.2020.38.3.176","DOIUrl":"https://doi.org/10.7470/jkst.2020.38.3.176","url":null,"abstract":"The aging problem is a significant issue in terms of overall aspects of society, and the need for making traffic safety policies is of keen interest because the increase in elderly drivers may have an impact on traffic safety. Therefore, the primary purpose of this study was to identify the characteristics of elderly drivers’ driving behaviors on freeways and to evaluate the workload of elderly drivers. The driving behavior of subjects was evaluated by utilizing the trajectory data optained from driving simulation experiments. In addition, the workload of subjects was estimated based on the ratio of beta waves to entire brain waves, which were collected while the participants were conducting the driving experiment. As a result, the average of elderly drivers’ speed was lower by 6% than non-elderly drivers. However, the average of the standard deviation of elderly drivers’ speed, which is a measure of effectiveness to represent the longitudinal driving stability, was higher about 25% than non-elderly drivers. Moreover, the average of the standard deviation of the lane position of elderly drivers on freeways, which indicates how they are stable on lateral driving, was higher about 31% compared to non-elderly drivers. Besides, the amount of beta wave of elderly drivers, which shows a driver’s psychological workload, was higher about 11% than non-elderly drivers. This study is expected to be utilized as a fundamental data when policies for elderly drivers are established in order to improve traffic safety in the aging society.","PeriodicalId":146954,"journal":{"name":"Journal of the Eastern Asia Society for Transportation Studies","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132999817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.7470/jkst.2020.38.3.208
Seung-jae Lee, Sungyong Na, Donggyun Ku, Jooyoung Kim
UK government has revised its transport appraisal manual called WebTAG to accommodate various environmentally friendly transport projects in a wider perspective, which was commissioned by Sir Eddingtons’s transport studies. The guidance has triggered to revise the other transport appraisal guidances of commonwealth countries and international agencies such as OECD and WHO (World Health Organization). This paper therefore reviews the newly revised transport guidances for accommodating wider benefits currently used in OECD, UK, Australia and New Zealand. And then we attempt to draw some basic ideas commonly used and applicable in order to apply for calculating some environmentally friendly transport projects in downtown of Seoul such as Old Town Renaissance Project and Seoul’s high line project. In particular, we calculate health improvement benefits, which are comparable with WHO’s HEAT and UK’s SART health benefit in the framework of an impact analysis used in USA and OECD. These valuations of the health improvement benefits used in WHO, UK and New Zealand government guidances are used in the baseline to calculate willingness to pay of health improvement in Seoul cases. We have found that these benefits are not negligible by comparison with the existing core benefits such as travel time saving and vehicle operating cost saving benefits.
{"title":"Wider Benefits in Transport Projects Using an Impact Analysis Evaluation Method","authors":"Seung-jae Lee, Sungyong Na, Donggyun Ku, Jooyoung Kim","doi":"10.7470/jkst.2020.38.3.208","DOIUrl":"https://doi.org/10.7470/jkst.2020.38.3.208","url":null,"abstract":"UK government has revised its transport appraisal manual called WebTAG to accommodate various environmentally friendly transport projects in a wider perspective, which was commissioned by Sir Eddingtons’s transport studies. The guidance has triggered to revise the other transport appraisal guidances of commonwealth countries and international agencies such as OECD and WHO (World Health Organization). This paper therefore reviews the newly revised transport guidances for accommodating wider benefits currently used in OECD, UK, Australia and New Zealand. And then we attempt to draw some basic ideas commonly used and applicable in order to apply for calculating some environmentally friendly transport projects in downtown of Seoul such as Old Town Renaissance Project and Seoul’s high line project. In particular, we calculate health improvement benefits, which are comparable with WHO’s HEAT and UK’s SART health benefit in the framework of an impact analysis used in USA and OECD. These valuations of the health improvement benefits used in WHO, UK and New Zealand government guidances are used in the baseline to calculate willingness to pay of health improvement in Seoul cases. We have found that these benefits are not negligible by comparison with the existing core benefits such as travel time saving and vehicle operating cost saving benefits.","PeriodicalId":146954,"journal":{"name":"Journal of the Eastern Asia Society for Transportation Studies","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124993882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.7470/jkst.2020.38.3.218
L. Young, Eunsol Cho, Oh， Cheol, Kang， Sun-Hwa, Choe， Byongho
The in-depth crash causes analysis for commercial vehicles is necessary to develop more effective safety countermeasures because the crash severity due to commercial vehicles is much higher than other vehicle types. A viable countermeasure to cope with commercial vehicle crashes is to conduct a traffic safety consulting for commercial vehicle drivers. The purpose of this study is to classify the pattern of taxi drivers, which is a fundamental to developing a customized consulting program. A two-stage clustering methodology is adopted to recognize the pattern of taxi drivers based on driver’s intrinsic characteristics underlying the cause of the crash occurrence that include working, health, and living conditions. Results show that it is desirable to classify taxi drivers into four groups such as ‘overworking’, ‘life-imbalanced’, ‘work and life-balanced’, and ‘unspecified-normal’. Discussions on how to use four driver patterns in conducting the safety consulting are presented. In addition, an example of consulting method is presented, which is expected to be used for developing effective consulting programs.
{"title":"Pattern Classification of Taxi Drivers Based on Work and Living Conditions for Commercial Vehicle Safety Management System","authors":"L. Young, Eunsol Cho, Oh， Cheol, Kang， Sun-Hwa, Choe， Byongho","doi":"10.7470/jkst.2020.38.3.218","DOIUrl":"https://doi.org/10.7470/jkst.2020.38.3.218","url":null,"abstract":"The in-depth crash causes analysis for commercial vehicles is necessary to develop more effective safety countermeasures because the crash severity due to commercial vehicles is much higher than other vehicle types. A viable countermeasure to cope with commercial vehicle crashes is to conduct a traffic safety consulting for commercial vehicle drivers. The purpose of this study is to classify the pattern of taxi drivers, which is a fundamental to developing a customized consulting program. A two-stage clustering methodology is adopted to recognize the pattern of taxi drivers based on driver’s intrinsic characteristics underlying the cause of the crash occurrence that include working, health, and living conditions. Results show that it is desirable to classify taxi drivers into four groups such as ‘overworking’, ‘life-imbalanced’, ‘work and life-balanced’, and ‘unspecified-normal’. Discussions on how to use four driver patterns in conducting the safety consulting are presented. In addition, an example of consulting method is presented, which is expected to be used for developing effective consulting programs.","PeriodicalId":146954,"journal":{"name":"Journal of the Eastern Asia Society for Transportation Studies","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131771946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.7470/jkst.2020.38.3.167
Jooyoung Kim, Jangwon Jin
Recent construction of Trans-Korean Railway result in travel time reduction and also production and employment increase during construction phase. Those direct benefits are estimable using existing development methodology. But indirect benefits such as community development and economy, social culture are hard to be quantified. Therefore, this study estimated the economic benefits in terms of regional economy, development, and socio-cultural aspects of the operation of Trans-Korean Railway by using CVM (Contingent Valuation Method). It surveyed 545 adults over 20 years old, and estimated willingness to pay on usage of Trans-Korean Railway. As a result, respondents were willing to pay 13,824 won per household in residence tax. Moreover, total annual economic benefit regional economic and social culture due to Trans-Korean Railway is estimated to be 291.9 billion won.
{"title":"Estimation of Willingness to Pay by Trans-Korean Railway Connection Using CVM","authors":"Jooyoung Kim, Jangwon Jin","doi":"10.7470/jkst.2020.38.3.167","DOIUrl":"https://doi.org/10.7470/jkst.2020.38.3.167","url":null,"abstract":"Recent construction of Trans-Korean Railway result in travel time reduction and also production and employment increase during construction phase. Those direct benefits are estimable using existing development methodology. But indirect benefits such as community development and economy, social culture are hard to be quantified. Therefore, this study estimated the economic benefits in terms of regional economy, development, and socio-cultural aspects of the operation of Trans-Korean Railway by using CVM (Contingent Valuation Method). It surveyed 545 adults over 20 years old, and estimated willingness to pay on usage of Trans-Korean Railway. As a result, respondents were willing to pay 13,824 won per household in residence tax. Moreover, total annual economic benefit regional economic and social culture due to Trans-Korean Railway is estimated to be 291.9 billion won.","PeriodicalId":146954,"journal":{"name":"Journal of the Eastern Asia Society for Transportation Studies","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128254344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-30DOI: 10.7470/jkst.2020.38.2.085
S. Lim, Jihan Choi, Shezeen Oah
{"title":"Effects of Gateway on Reducing Vehicle Speeds in School Zones","authors":"S. Lim, Jihan Choi, Shezeen Oah","doi":"10.7470/jkst.2020.38.2.085","DOIUrl":"https://doi.org/10.7470/jkst.2020.38.2.085","url":null,"abstract":"","PeriodicalId":146954,"journal":{"name":"Journal of the Eastern Asia Society for Transportation Studies","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115691433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-30DOI: 10.7470/jkst.2020.38.2.148
Sung-Hoon Kim, Hwapyeong Yu, H. Yeo
Various methods using GPS or vehicle detectors have been developed in estimating the travel time of individual road sections, but several problems still exist in terms of estimation accuracy. In particular, at the upstream of diverging road sections such as highway junctions and urban road intersections, traffic flow starts to diverge according to the traveling direction of vehicles. In such a case, the diverged flow behaviors can differ from each other, and differences in travel time towards each direction can be observed even in the same road section. Accordingly, it is necessary to estimate the travel time of a diverging road section by the traveling directions. For this purpose, this study provides a method for estimating the travel time of different traveling direction at the upstream of diverging highway sections using the GPS-based time stamp data. Three sequential steps with a few statistical approaches are provided in this stage: divergence detection in data, classification of diverged data, outlier filtering. In ‘data divergence detection’, a new statistical analysis method that can detect the occurrence of data divergence is provided, and it is analyzed that the method is useful in finding the threshold of determining data divergence. In ‘classification of diverged data’, a statistical approach is presented to classify the data by travel directions, and it is found that our modified method shows superior performance compared to others. In ‘outlier filtering’, a simple moving average is used to remove the data showing abnormal behaviors, but it is analyzed that this approach requires further improvement. The performance of the proposed method is tested using a microscopic simulation program. Through the tests, it is shown that the proposed method has reasonable performance in estimating the travel in the same road section by the travel directions.
{"title":"A Study on Travel Time Estimation in Diverging Road Sections of Uninterrupted Traffic Flow based on Timestamp Data Analysis","authors":"Sung-Hoon Kim, Hwapyeong Yu, H. Yeo","doi":"10.7470/jkst.2020.38.2.148","DOIUrl":"https://doi.org/10.7470/jkst.2020.38.2.148","url":null,"abstract":"Various methods using GPS or vehicle detectors have been developed in estimating the travel time of individual road sections, but several problems still exist in terms of estimation accuracy. In particular, at the upstream of diverging road sections such as highway junctions and urban road intersections, traffic flow starts to diverge according to the traveling direction of vehicles. In such a case, the diverged flow behaviors can differ from each other, and differences in travel time towards each direction can be observed even in the same road section. Accordingly, it is necessary to estimate the travel time of a diverging road section by the traveling directions. For this purpose, this study provides a method for estimating the travel time of different traveling direction at the upstream of diverging highway sections using the GPS-based time stamp data. Three sequential steps with a few statistical approaches are provided in this stage: divergence detection in data, classification of diverged data, outlier filtering. In ‘data divergence detection’, a new statistical analysis method that can detect the occurrence of data divergence is provided, and it is analyzed that the method is useful in finding the threshold of determining data divergence. In ‘classification of diverged data’, a statistical approach is presented to classify the data by travel directions, and it is found that our modified method shows superior performance compared to others. In ‘outlier filtering’, a simple moving average is used to remove the data showing abnormal behaviors, but it is analyzed that this approach requires further improvement. The performance of the proposed method is tested using a microscopic simulation program. Through the tests, it is shown that the proposed method has reasonable performance in estimating the travel in the same road section by the travel directions.","PeriodicalId":146954,"journal":{"name":"Journal of the Eastern Asia Society for Transportation Studies","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132481128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-30DOI: 10.7470/jkst.2020.38.2.097
B. Suh, Gyuseung Kim, Chae-Il Lim, H. Ha
While a variety of papers consider only the competition between the two transportation means: aviation and high-speed rail (HSR), we analyze the effects of competition between the three parties by distinguishing aviation from full-service carrier (FSC) and low-cost carrier (LCC). This paper investigates the effect of the high-speed rail‘s competition strategies (weight of welfare, rail speed and access time to transport terminals) on the equilibrium ticket price and market shares of each transportation mode with the use of an adapted Circular city model. The results show how the price and market share changes depending on the variation of the three variables. We further suggest implications from the perspective of each competitor based on the results. Finally, an empirical study on Korea’s transportation markets is conducted to verify the proposed model and analyze the market situation.
{"title":"Effects of High-speed Rail’s Competition Strategies on Price and Share in the Transportation Market","authors":"B. Suh, Gyuseung Kim, Chae-Il Lim, H. Ha","doi":"10.7470/jkst.2020.38.2.097","DOIUrl":"https://doi.org/10.7470/jkst.2020.38.2.097","url":null,"abstract":"While a variety of papers consider only the competition between the two transportation means: aviation and high-speed rail (HSR), we analyze the effects of competition between the three parties by distinguishing aviation from full-service carrier (FSC) and low-cost carrier (LCC). This paper investigates the effect of the high-speed rail‘s competition strategies (weight of welfare, rail speed and access time to transport terminals) on the equilibrium ticket price and market shares of each transportation mode with the use of an adapted Circular city model. The results show how the price and market share changes depending on the variation of the three variables. We further suggest implications from the perspective of each competitor based on the results. Finally, an empirical study on Korea’s transportation markets is conducted to verify the proposed model and analyze the market situation.","PeriodicalId":146954,"journal":{"name":"Journal of the Eastern Asia Society for Transportation Studies","volume":"52 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130709346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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