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e radius of cu wers limit their e lateral accele

e radius of cu wers limit their e lateral accele

Traffic and Highway Engineering
Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter15: Geometric Design Of Highway Facilities
Section: Chapter Questions
Problem 21P
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2/108 The figure shows two possible paths for negotiating an unbanked turn on a horizontal portion of a race course. Path A-A follows the centerline of the road and has a radius of curvature PA = 85 m, while path B-B uses the width of the road to good advan- tage in increasing the radius of curvature to PB = 200 m. If the drivers limit their speeds in their curves so that the lateral acceleration does not exceed 0.8g, determine the maximum speed for each path. A B PB = 200 m PA = 85 m 4 B 2/109 From an = ²₁ U=√an = √0.8g 12 A√0.89 PA=0.8 (1.81(85) = 25.8 m/s Ug = √0.8918 = √0.8 (1.81)(200) = 39.6 m/s Path BB offers a considerable advantage.
Transcribed Image Text:2/108 The figure shows two possible paths for negotiating an unbanked turn on a horizontal portion of a race course. Path A-A follows the centerline of the road and has a radius of curvature PA = 85 m, while path B-B uses the width of the road to good advan- tage in increasing the radius of curvature to PB = 200 m. If the drivers limit their speeds in their curves so that the lateral acceleration does not exceed 0.8g, determine the maximum speed for each path. A B PB = 200 m PA = 85 m 4 B 2/109 From an = ²₁ U=√an = √0.8g 12 A√0.89 PA=0.8 (1.81(85) = 25.8 m/s Ug = √0.8918 = √0.8 (1.81)(200) = 39.6 m/s Path BB offers a considerable advantage.
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