KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

  • 제33권6호
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  • Pages.2427-2435
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  • 2013
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  • 1015-6348(pISSN)
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  • 2799-9629(eISSN)
Korean Society of Civil Engeneers (대한토목학회)
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Estimating Road Design Hourly Volume via Inflection Point Identification

변곡점 탐색을 통한 도로설계시간계수 산정

  • 안성채 (아주대학교 건설교통공학과) ;
  • 최기주 (아주대학교 교통시스템공학과) ;
  • 김부원 ((주)지비티에스 엔지니어링)
  • 투고 : 2013.03.05
  • 심사 : 2013.07.29
  • 발행 : 2013.11.30
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초록

Design hourly volume and the K-factor, first proposed by FHWA in the 1950s, is based on the 30th hourly traffic volume during a year (out of 8,760 hours). It was used when surveying the traffic volume was laborious in the past and is still being used now although it leaves some to be desired for practical applications. More reasonable K-factor for better design, based on theoretical evidence, is needed. This paper proposes the knee searching method based on simple linear regression to find out the inflection point of the volume ranking curve that describe the annual 8,760 hourly traffic volumes. The method was applied to the Chungcheong province's national highway, and the results were compared to the existing guidelines' values of K-factors. Identified design hourly traffic volumes ranked between 43rd to 694th, which is much lower than the 30th volume, meaning that some overdesign examples are inevitable if the conventional $30^{th}$ volume is used.

설계시간계수는 1950년대 FHWA에서 최초로 제안하였던 개념으로 1년(8,760시간) 중 상위 30번째 순위의 시간교통량을 기반으로 한다. 과거, 모든 시간대의 교통량 조사가 힘들었던 시기에 사용되었던 방식으로 다소의 문제점에도 불구하고 현재까지 사용되고 있다. 합리적인 설계를 위해서는 이론적 근거에 바탕을 둔 설계시간계수 도출이 필요하다. 본 연구는 현재까지 고수되고 있는 30번째 순위가 과연 옳은 것인가에 중점을 두고 있으며, 이를 해결하기 위해 8,760 시간교통량 순위곡선에서 변곡점을 탐색할 수 있는 기법을 제안하였다. 그리고 충청권 일반국도를 대상으로 제안 방법론을 적용하여 분석대상지점의 설계시간계수를 산정하였으며, 기존 지침의 내용과 비교하였다. 설계시간순위는 43~694순위로 일반적으로 사용되는 30순위보다 모두 하위 순위에서 발생되고 있었던바, 30순위 교통량을 사용할 경우 약간의 과다설계가 이루어 질수 있음이 확인되었다.

키워드

참고문헌

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피인용 문헌

  1. Design Hourly Factor Estimation with Railway Passenger Data vol.16, pp.1, 2017, https://doi.org/10.12815/kits.2017.16.1.64