A compound curve has the following properties: R1 = use 480 ft; R2 is 70% of R1 1 = 24°, 2 = 34° Determine the following: Tangent Length of Curve 1 only (t1), Tangent Length of Curve 2 only (t2) Length of first and second curves Sta. of PC and PT; given PCC is at Sta. 795+18.20

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 7P
Question

A compound curve has the following properties:


R1 = use 480 ft; R2 is 70% of R1
1 = 24°, 2 = 34°
Determine the following:


Tangent Length of Curve 1 only (t1), Tangent Length of Curve 2 only (t2)
Length of first and second curves
Sta. of PC and PT; given PCC is at Sta. 795+18.20
External Distance, for the first curve only
Middle Ordinate, for the second curve only
Design speed (5 mi/hr significance) using a constant friction coefficient value of 0.15 and cross-section or superelevation of 8%

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