Browse > Article
http://dx.doi.org/10.12652/Ksce.2010.30.2D.105

Analysis Study on the Microscopic Characteristics of Freeway Free Flow Speed  

Yoon, Byoung Jo (인천대학교 도시과학대학 도시환경공학부)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.30, no.2D, 2010 , pp. 105-111 More about this Journal
Abstract
Operating speed is one of key elements in the design and operation of freeway. Few studies have been carried out macroscopically to find characteristics of free-flow speed (FFS) using small sample size and not considering the conditions of traffic volume and the effects of hour periods. As an attempt to find out the characteristics of FFS, this study microscopically analysed both the distributions of freeway FFS and percentile speeds according to traffic volume and daily hour periods using huge sample size. It was found out that speed distributions are changed and showed different behaviors under the conditions of traffic volumes(1-5 veh/30sec) and daily hour periods(0-5, 6-8, 9-11, 12-19, 20-23). V85(85th percentile speed) at morning, night, and midnight period decreases according to increase in traffic volume respectively, whereas V85 at day time does not show considerable differences. So the behaviors of V85 according to hour periods dramatically changed according to the increase in traffic volume.
Keywords
rural freeway; free flow speed; operating speed; microscopic approach; characteristics according to traffic volume and hour period;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 건설교통부(2000) 도로의 구조.시설기준에 관한 규칙 해설 및 지침.
2 김용석, 조원범(2005) 도로 설계속도, 주행속도, 제한속도의 관계 분석 연구, 대한교통학회지, 대한교통학회, 제23권 제7호, pp. 35-42.   과학기술학회마을
3 대한교통학회(2003) 도로용량편람.
4 AASHTO (1994, 2001) A Policy on Geometric design of highway and street.
5 Fitzpatrick, K., Carlson, P., Brewer, M., and Wooldridge, M. (2003) Design speed, operating speed, and posted speed limit practices, TRB, Washington, D.C.
6 Krammes, R. A., Fitzpatrick, K., Blaschke, J. D., and Fambro, D. B. (1996) Speed: understanding design, operating, and posted speed, Texas Transportation Inst., College station.
7 Mannering, F. L., Kilareski, W. P. et al. (2002) Principles of Highway Engineering and Traffic Analysis, 3re Ed. New York: Wiley.
8 McLean, J. (1981) Driver speed behaviour and rural road alignment design, Traffic engineering & control, Vol. 22, Printerhall Limited, London, England.
9 Schurr, K. S., McCoy, P. T., Pesti, G., and Huff, R. (2001) Relationship bet. design, operating and posted speeds on horizontal curves on rural two-lane highways in Nebraska.
10 TRB (2000) Highway capacity manual.