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http://dx.doi.org/10.7855/IJHE.2015.17.1.105

A Method of Compounding Application of Longitudinal Grade and Superelevation on Left Curved Section in Arterial for Preventing Hydroplaning  

Jung, Ji Hwan (경기대학교 도시.교통공학과)
Oh, Heung Un (경기대학교 도시.교통공학과)
Publication Information
International Journal of Highway Engineering / v.17, no.1, 2015 , pp. 105-118 More about this Journal
Abstract
PURPOSES : This study aims to evaluate the road safety of the super-elevation transition section of a left turn curve and suggest the minimum longitudinal grade of a super-elevation transition section to be used before and after a left curved section. METHODS : We evaluated the road condition by means of the safety-criterion-evaluation method involving side friction factors, and then solve the problem by introducing the minimum longitudinal grade criterion based on conditions described in the hydraulics literature. RESULTS : It was calculated that when a road satisfies hydroplaning conditions, the difference between side friction assumed and side friction demanded is less than -0.04. In this case, the safety criterion for the condition is unsatisfied. Conversely, when a road is in a normal state under either wet or dry conditions, it was calculated that the difference between side friction assumed and side friction demanded is more than 0.01. Thus, the safety criterion for this condition is found to be satisfied. After adjusting the minimum longitudinal grade applied to a super-elevation transition section, the hydroplaning condition can be eliminated and the safety criterion can be met for all sections. CONCLUSIONS : It is suggested that a minimum longitudinal grade should be provided on super-elevation transition sections in order to prevent hydroplaning.
Keywords
longitudinal grade; cross slope; safety criterion; hydroplaning; vertical grade; highway; superelevation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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