Question

1.)The common tangent of a certain compound curve is parallel to its long chord. Its 350m long chord makes an angle of 18° and 10° with the shorter and longer tangents, respectively.

a.)Determine the length of the common tangent.

b.)Determine the length of the compound curve.

2.) A 4° simple curve has an intersection angle of 25°. Use arc basis.

a.) Determine the distance from the midpoint of the long chord to the intersection of the tangents at PC and PT.

Answer #1

1) The tangent length of a simple curve was 202.12 m and the
degree of curvature 3°4’ (30m-chord). Calculate the radius, apex
distance, the rise, main chord, the length of curve and the
deflection angle.

A compound curve has the following data:
I1 = 25
D1 = 2 STA
PI = 25+120.50
I2 = 28
D2 = 4
a.) Determine the length of the long chord of the compound
curve.
b.) Determine the length of the common tangent.
c.) Determine the length of the compound curve.

A reverse curve is being designed to join two roadways whose
centerlines are parallel and 72 ft apart. The two simple circular
curve components are identical. The line connecting points x and y
in the figure is 500 ft long; line x-y is tangent to the curves at
the PRC. The station of the PI1 for the first component curve
(point x) is 23+45.67
Determine:
The central angle of each component curve
The length of each component curve...

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