Given the angle of intersection between two tangent of a spiral curve is 42°, degree of curve is 10°, radius of the simple curve is 114.59m, spiral angle is 17°, designed speed is 60kph, find the length of spiral "Ls" using designed speed.  a) 78m b)77m c)68m d)67m

Structural Analysis
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Chapter2: Loads On Structures
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Given the angle of intersection between two tangent of a spiral curve is 42°, degree of curve is 10°, radius of the simple
curve is 114.59m, spiral angle is 17°, designed speed is 60kph, find the length of spiral "Ls" using designed speed. 

a) 78m
b)77m
c)68m
d)67m

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