Steps for Superelevation design

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Design Step-1: The superelevation for 75 percent of design speed is calculated neglecting the friction.

ecal = V^2/225R

Step-2: If ea<emax(7%) eca is provided If ec> ene(7%) then provide the maximum superelevation equal to 0.07 & proceed with step (3) & step (4).

Step-3: Check the coefficient of friction developed for the maximum value of 'e' =0.07 at the full value of design speed.
gy, Kharag

f = {(V2 / 127 R) - 0.07)

If the value of f thus calculated is less than 0.15, t superelevation of 0.07 is safe for the design speed If not, calculate the restricted speed as given in step (4)

Step 4: Allowable speed (V, km/h) at the curve is calculated by considering the design coefficient of lateral friction and the maximum superelevation

e + f = 0.07+ 0.16 = 0:22 = V 2/127 R

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