Horizontal Curve (Superelevation Calculation Sheet).xls: The Ultimate Tool for Highway Design Profes

Fitzpatrick et al. (2000a) collected data on two-lane rural highways in several States to predict the 85th-percentile speed of passenger cars. The 85th-percentile operating speed models are shown in table 33 in appendix A and include the radius of curvature and the rate of vertical curvature. The radius of curvature was found to be the best predictor of operating speeds for horizontal curves on grade, while the rate of vertical curvature was found to be the best indicator of operating speeds on vertical curves that are present on horizontal tangent sections. (Fitzpatrick et al. 2000a) It was determined that the radius of curve significantly affects the 85th-percentile operating speeds on horizontal alignments. When the radius of curve is approximately 820 ft (250 m), 85th-percentile operating speeds decrease sharply, while 85th-percentile speeds on curves with a radius of approximately 2,625 ft (800 m) are similar to the 85th-percentile operating speed on long tangents. (Fitzpatrick et al. 2000a)

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