If R is the radius of the main curve, θ the angle of deflection, S th – McqOptions

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

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