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Highway Engineering

Q1: An upgrade g1% is followed by a downgrade g2%. The equation of the parabolic curve of length L to be introduced, is given by

A

B

C

D

ANS:B -

Equation of parabolic curve y=(NX2)/(2L).

Where N is gradient N=n1-n2.
n1 is positive for downward gradient.
n2 is negative for upward gradient.
So N=g1-(-g2).
N=g1+g2.
Finally y=(g1+g2)X2/(2L).



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