Highway Engineering
The desirable length of overtaking zone as per IRC recommendation is equal to

overtaking sight distance
two times the overtaking sight distance
five times the overtaking sight distance
three times the overtaking sight distance

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Highway Engineering
For a constant value of coefficient of lateral friction, the value of required super-elevation increases with

increase in both speed and radius of curve
decrease in both speed and radius of curve
decrease in speed and with increase in radius of curve
increase in speed and with decrease in radius of curve

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