e radius of cu wers limit their e lateral accele
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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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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