Affiliation:
1. Department of Civil and Environmental Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada.
Abstract
A key to better geometric design of highways is designing horizontal curves conforming to driver behaviour. The values of side friction factors in the point mass formula, used for the design of the minimum radius of a horizontal curve, are based on the upper threshold of driver comfort. In the current guidelines, these driver comfort levels were established in research work carried out back in the 1930s. Recently, it was found that faster drivers tend to accept higher comfort thresholds to maintain their speed and minimize speed reduction between curve and tangent. An experiment was designed at Carleton University to collect newer data on driver behaviour including speed and lateral acceleration. The results confirmed the need to revise the values of side friction demand especially for sharp curves. In addition, a model was developed to determine the side friction factor to be used in design or in consistency evaluation of horizontal curves on rural roads and ramps.
Publisher
Canadian Science Publishing
Subject
General Environmental Science,Civil and Structural Engineering
Reference10 articles.
1. AASHTO. 2004. A policy on geometric design of highways and streets. American Association of State Highway and Transportation Officials, Washington, D.C.
2. Side Friction and Speed as Controls for Horizontal Curve Design
3. Bonneson, J.A. 2000. Superelevation distribution methods and transition designs. National Cooperative Highway Research Program Report 439, Transportation Research Board, National Research Council, Washington, D.C.
4. Relationships Between Ball Bank Indicator Readings, Lateral Acceleration Rates, and Vehicular Body-Roll Rates
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