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

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

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Highway Engineering
In case of summit curves, the deviation angle will be maximum when

a descending gradient meets with another descending gradient
an ascending gradient meets with another ascending gradient
an ascending gradient meets with a level surface
an ascending gradient meets with a descending gradient

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