If R is the radius of the main curve, ? the angle of deflection, S the shift and L the length of the transition curve, then, total tangent length of the curve, is
Options
A. (R - S) tan ?/2 - L/2
B. (R + S) tan ?/2 - L/2
C. (R + S) tan ?/2 + L/2
D. (R - S) tan ?/2 + L/2
E. (R - S) cos ?/2 + L/2
Correct Answer
(R + S) tan ?/2 + L/2
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