• 한국ITS학회:학술대회논문집
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• 2003.11a
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• pp.132-135
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• 2003

• Journal of Korean Society of Transportation
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• v.23 no.6 s.84
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• pp.91-102
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• 2005

When it comes to the process of information storage, people are likely to organize individual information into the forms of groups rather than independent attributes, and put them together in their brains. Likewise, in case of finding the shortest path, this study suggests that a Hierarchical Road Network(HRN) model should be selected to browse the most desirable route, since the HRN model takes the process mentioned above into account. Moreover, most of drivers make a decision to select a route from origin to destination by road hierarchy. It says that the drivers feel difference between the link travel tine which was measured by driving and the theoretical link travel time. There is a different solution which has predicted the link travel time to solve this problem. By using this solution, the link travel time is predicted based on link conditions from time to time. The predicated link travel time is used to search the shortest path. Stochastic Process model uses the historical patterns of travel time conditions on links. The HRN model has compared favorably with the conventional shortest path finding model in tern of calculated speeds. Even more, the result of the shortest path using the HRN model has more similar to the survey results which was conducted to the taxi drivers. Taxi drivers have a strong knowledge of road conditions on the road networks and they are more likely to select a shortest path according to the real common sense.

• Journal of Korean Society of Transportation
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• v.21 no.6
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• pp.17-26
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• 2003

주간선도로의 ITS 사업 등 동적정보의 제공이 최근 도로이용자에게 제공되고 있으나, 지방부의 정적인 정보를 제공하는 도로표지는 아직도 안내기능이 취약한 것이 사실이다. 지방부 도로를 대표하는 지방도는 연장에 있어서 모든 도로를 통해서 최장이며 고속국도, 국도, 국가지원지방도와 함께 복잡한 도로망을 형성하고 있다. 즉, 도로의 대종을 차지하는 지방도는 아직도 정적정보제공기반도 취약하다는 것이며, 증가하는 수요에도 불구하고 길 찾기의 기능이 가장 미흡한 도로가 지방도이다. 이러한 지방도의 경우 같은 위계의 지방도 간에도 노선연장 및 지역적 차이가 크며, 노선의 연속성 또한 미약하다. 이러한 지방도 도로안내체계의 문제를 해결하기 위해 본 연구에서는 노선별 적절한 안내지명을 선정하고, 선정된 지명을 통해 도로안내 및 표지간의 연계성을 유지하기 위한 도로표지시스템을 개발하는 것이 목적이다. 이동에 있어 중추적 기능을 수행하는 도로가 아닌 지방도는 장거리 통행을 위한 위계 높은 도로와의 연계가 필수적인 만큼 본 연구에서는 도로표지규칙의 지방도 안내지명 선정에 대한 선정원칙을 재검토하고, 지방도의 적절한 안내지명 선정을 위해서 타 노선과의 연계유형을 분석하였다. 분석결과 9가지의 유형을 도출하였고, 도출된 노선연계 유형을 기반으로 노선별 거점을 선택하는 것으로 하였다. 한편, 안내지명에 대한 설문을 실시하였고, 그 결과 각 노선별 거점을 중요지와 주요지로 구분하여 정의, 선정하여 안내를 위한 기본 틀을 제시하였다. 제시된 안내지명서정요령 및 틀을 통해 지방도내의 및 지방도와 기타도로와의 연계성이 더욱 고조되고, 안내체계의 효율성의 증대가 기대된다.

• Journal of Korean Society of Transportation
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• v.24 no.1 s.87
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• pp.7-18
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• 2006

Nowadays, the movement of commercial vehicles has caused severe congestion, environmental problems and damaged pavements in urban area. To solve the Problems, this research has proposed a methodology to build-up a freight network that is enable to manage the movement and demand of commercial vehicles. The network based on urban arterial network has developed according to freight traffic volume that is under the influence of road types among The in study area. Freight network has been developed by assignment method of 4-step transportation forecasting. Once, acceptable limits of freight traffic volume are decided, freight network can be developed using the capacity To confirm the application of the methodology, freight network of Seoul city has developed by the methodology.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.17 no.2
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• pp.32-38
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• 2018

Studies on classification of national roads have been continued, but there is little research on the classification of urban arterial roads. Due to the increase of traffic volume, urban arterial roads do not perform well as main roads. In this paper, the function of urban arterial road was established by using cluster analysis using traffic characteristics. Traffic characteristics such as traffic volume, weekend coefficient and speed coefficient were used to establish the functions of 55 main arterial roads in Seoul. The results of this paper are compared with those of the method using AADT. The method using AADT classifies the characteristics according to the traffic volume of the whole lane. In this paper, however, the results are derived using the traffic volume per lane reflecting the actual traffic volume. In addition, the functional classification of the arterial roads in Seoul was compared with the results of this paper to verify that the traffic characteristics were reflected. As a result, the method presented in this paper is more effective in showing traffic characteristics than the current highway functional classification method, and the functional classification system will be helpful for road extension and planning design.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.18 no.2
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• pp.12-28
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• 2019

Road geometry is one of the many factors that cause crashes, but the effect on traffic accident depends on weather conditions even under the same road geometry. This study identifies the variables affecting the crash severity by matching the highway accident data and weather data for 14 years from 2001 to 2014. A hierarchical ordered Logit model is used to reflect the effects of road geometry and weather condition interactions on crash severity, as well as the correlation between individual crashes in a region. Among the hierarchical models, we apply a random intercept model including interaction variables between road geometry and weather condition and a random coefficient model including regional weather characteristics as upper-level variables. As a result, it is confirmed that the effects of toll, ramp, downhill slope of 3% or more, and concrete barrier on the crash severity vary depending on weather conditions. It also shows that the combined effects of road geometry and weather conditions may not be linear depending on rainfall or snowfall levels. Finally, we suggest safety improvement measures based on the results of this study, which are expected to reduce the severity of traffic accidents in the future.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.1182-1185
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• 2013

도로명주소가 법적 주소체계로 지정되고 2014년도부터 전면 시행을 앞두고 있는 상황에서 기존의 지번주소를 도로명주소로 변경하려는 수요가 늘고 있으며 그에 따라 주소 전환 서비스를 제공하는 솔루션들이 증가하고 있다. 행정구역 체계에 따라 단계별로 입력된 지번주소의 도로명주소로의 변환은 크게 어렵지 않고 변환 성공율도 상당히 높지만 자유롭게 입력하여 정제되지 않은 형태의 주소는 전환에 실패하는 경우가 많다. 본 논문에서는 전산입력된 지번주소를 도로명주소로 변환시 주소형태가 정제되지 않은 상황에서도 변환 성공률을 높이기 위해 행정구역 줄임, 일부 주소정보 누락, 오타 등 여러 가지 변형 케이스에 대해서도 유연하게 변환을 수행하는 방안을 연구하였다. 이를 통해 기존 지번 주소의 표준 형태로의 정제는 최대 두 배까지 변환효율을 높일 수 있었다. 그러나 변환시 사용하는 도로명주소 매칭 테이블에 자료의 누락, 건물명의 불일치, 지번과 건물의 1:1 매칭이 되지 않는 경우가 존재하여 원활한 주소 전환을 위해서는 데이터의 정비가 필요하다.

• Journal of Korean Society of Transportation
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• v.25 no.4
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• pp.33-42
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• 2007

This study analyzes presentation methods of traffic guide maps to guide drivers easily and correctly to their destinations on complex road networks. The problems of Korea's guidance systems were analyzed and domestic and international road guide maps were compared. This study includes the problems of road number discernment, such as the sizes, colors and marking intervals on the map. The widths and colors of different hierarchical roads were evaluated. The indices, enlarged downtown maps and uncertainty of grade separation on the map were analyzed and the solutions were also provided.

• Journal of Korean Society of Transportation
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• v.22 no.5
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• pp.47-57
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• 2004

This study introduces the areawide road safety improvement program, which was developed to overcome the weak points of conventional black spot improvement programs. The latter has been criticized in terms of that it can cause the problem of accident migration and that it prevents from identifying causes of road accident in the comprehensive scope. On the other hand, the areawide road safety improvement program can allow us to find the route or areas that have quite a number of road accidents with the common causes. Therefore, we can take countermeasures effectively in a different framework in this approach. This study explains in detail about the concept, procedures, and effects of areawide road safety improvement programs including the example. This study may contribute to bringing a new framework of road safety improvement program in Korea.

• Journal of Korean Society of Transportation
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• v.29 no.1
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• pp.17-27
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• 2011

This paper investigates some critical errors influencing travel demand estimation in Korea Transportation Data Base (KTDB), and through this investigation reasonable traffic analysis zone (TAZ) size and internal trips ratio are analyzed. With varying zone size, the accuracy of travel demand estimation is studied and appropriate level of zone size in KTDB is also presented. For this purpose zonal structure consisting of location of zone centroid, number of centroid connecters has been constructed by social economic index, and then some descriptive statistical analyses such as F-test, coefficient of correlation are performed. From the results, this paper shows that the optimum levels of zone system were various according to the order and capacity of roads, and also shows that the smaller TAZ, the less error in this research. In conclusion, in order to improve accuracy of traffic demand estimation it is necessary to make zone size smaller.