• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.19 no.3
• /
• pp.245-251
• /
• 2001

Nowadays, the first design elements of horizontal alignment are very important things to extension or improvement of highway. When the design elements ale lost or damaged, it is necessary to recalculation. In this paper, an investigation is made on the method of representation of horizontal alignment as a result of design element using generalization method. The results show that northing calculated about 0.2∼5 meters and easting calculated about 1∼40 meters between calculated and design data. Because the maximum value is a very small compared to total horizontal alignment length. calculated data have been fined to presentation of observed highway.

• Journal of Korean Society of Transportation
• /
• v.23 no.5 s.83
• /
• pp.113-120
• /
• 2005

Highway geometric design aims to provide drivers with safe and efficient road conditions. Highway design method of Korea doesn't consider demand characteristics of drivers, vehicles etc. Therefore there is a gap between designer's expectation and user's behavior and it hinders to make safer roads. It is required to develop the geometric design criteria and design method based on driving characteristics to provide safe and flexible design. This study suggested a geometric design method of horizontal curves on rural 4-lane highways based on speed distribution.

• International Journal of Highway Engineering
• /
• v.11 no.1
• /
• pp.187-194
• /
• 2009

This paper presents the development of transfer function accounting for cross-anisotropic behavior of aggregate base material for the pavement thickness design. The stress distributions predicted by nonlinear cross-anisotropic finite element program were realistic by eliminating excessive tensile stress at the bottom of the base layer and the critical pavement responses predicted by nonlinear cross-anisotropic model are higher than those predicted by linear or nonlinear isotropic models (Kim, 2004, Kim et at., 2005). Since the previously developed transfer functions such as Asphalt Institute and Chevron models, etc. were based on the critical responses obtained from linear isotropic model, those equations are not appropriate for the thickness design nonlinear cross-anisotropic base behavior. Therefore, the development of usable transfer functions for nonlinear cross-anisotropic model is ever more important. When the newly developed transfer functions were compared with AASHTO method for the thickness design, the newly developed transfer functions produce approximately 25mm reduced UAB thickness in AASHTO thickness design and this illustrates that linear isotropic model results in more conservative pavement design.

• 한국도로학회지:도로
• /
• v.15 no.3
• /
• pp.40-45
• /
• 2013

• 한국도로학회:학술대회논문집
• /
• 2004.10a
• /
• pp.363-368
• /
• 2004

• 한국도로학회지:도로
• /
• v.12 no.1
• /
• pp.20-25
• /
• 2010

• Journal of Korean Society of Transportation
• /
• v.16 no.4
• /
• pp.195-212
• /
• 1998

본 연구는 새로운 설계일관성 검토기법의 정립을 위하여 수행되었으며, 이를 위해 속도추정 모형을 개발하였다. 본 연구를 통해 개발된 모형은 차량의 주행속도에 가장 큰 영향을 미치는 주 요소를 고려한 장점을 지니고 있다. 즉 평면곡선에서는 운전자의 시각적 판단을 기초로 등판차량의 주행속도를 추정하였다. 또한 이러한 속도추정이 승용차뿐만 아니라 트럭의 경우로 나누어 이루어짐으로써, 차종별 고려가 가능하도록 하였다. 다음은 본 연구를 통해 이루어진 결과이다. 평면곡선에서는 승용차와 트럭의 속도가 같게 추정되었으며, 시거를 통해 산정된 추정속도는 곡선반경과 밀접한 관계를 갖는다. 종단선형에서 승용차의 속도는 구배의 영향을 받지 않으나, 트럭은 구배의 영향으로 속도가 감소한다. 이 때 트럭에 작용되는 가속도는 모두 세 종류로써, 첫째, crawl speed에 도달할 때까지 작용한 가속도$(a_1)$와 둘째, crawl speed 이후 작용한 가속도$(a_2)$ 그리고 셋째, 하향구배 주행시 작용된 가속도$(a_3)$로 구분된다. Watanatade가 제시한 것과 같이 평지에서 나타나는 평면곡선의 주행속도와 구배지에서의 속도를 단순 비교 함으로써, 작은 속도의 궤적을 따라 평지에서 나타나는 평면곡선의 주행속도와 구배지에서의 속도를 단순 비교함으로써, 작은 속도의 궤적을 따라 합성선형의 속도를 추정하는 것은 합성선형이 차량의 주행속도에 미치는 영향을 간과한 것으로 판단할 수 있다. 그러나 본 모형에서는 합성선형의 영향을 고려하여 승용차와 트럭의 주행속도를 추정함으로써, 보다 현실적으로 주행속도를 추정하였다. 본 연구의 결과는 도로의 설계일관성을 검토하는데 매우 유용한 도구가 될 것이며 향후 운전자의 희망속도 결정, 감속율의 산정, 교통류의 고려, 도로설계의 전산화 자료와 연결 등을 통해 보다 실용적인 결과를 산출할 수 있을 것이다.

• 한국도로학회:학술대회논문집
• /
• 2004.10a
• /
• pp.377-382
• /
• 2004

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.21 no.4
• /
• pp.293-299
• /
• 2003

In the future, the design of road should be convenient in using of high-technology information and it needs the design of alignment that is able to make the maximum vehicles inducement function appropriated for CNS(Car Navigation System). So it needs to analysis appropriately the alignment of road for the improvement design of road which is established and to make the design of road and the coordinate of the main points. Therefore, this research had acquired the road data by RTK-GPS to accurate the analysis of road alignment and compared with Total Station. As the result, we could acquire the design source of the road alignment using RTK-GPS. Also, it was estimated the accuracy after comparing the design with RTK-GPS coordinates. We made an analysis of the degree of slant or the ups and downs of surface. We made an analysis of three dimensional visual information which was included in GSIS concept and estimated the accuracy. Finally, we analyzed the earth volume calculation by comparing with Total Station.

• Journal of Korean Society of Transportation
• /
• v.30 no.5
• /
• pp.61-69
• /
• 2012

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.