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A Study of Adjustment for Beginning & Ending Points of Climbing Lanes  

김상윤 (한국도로공사 도로교통기술원)
오흥운 (한국도로공사 도로교통기술원)
Publication Information
Journal of Korean Society of Transportation / v.24, no.5, 2006 , pp. 35-44 More about this Journal
Abstract
Acceleration and deceleration curves have been used for design purposes worldwide. The curve in design level has been regarded as an single deterministic curve to be used for design of climb lanes. It should be noted that the curve was originally made using ideal driving truck and that the curve is applied during design based on the assumption of no difference between ideal and real driving conditions. However. observations show that aged vehicles and lazy behavioring drivers nay make lower performance of vehicles than the ideal performance. The present paper provides the results of truck speeds at climbing lanes then probabilistic variation of acceleration and deceleration corves. For these purposes. a study about identification of vehicle makers, and weights for trucks at freeway toll gates and then observation of vehicle-following speed were performed. The 85%ile results obtained were compared with the deterministic performance curves of 180, 200, and 220 Ib/hp. It was identified that the performance of 85%ile results obtained from vehicle-following-speed observations were lower than one from deterministic performance curves. From these results, it may be concluded that at the beginning Point of climbing lanes additional $16.19{\sim}67.94m$ is necessary and that at the end point of climbing lanes $53.12{\sim}103.24m$ of extension is necessary.
Keywords
Standard Truck; Weight/Power Ratio; Vehicle Performance Curve; Vehicle Speed; Climbing Lane;
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