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

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

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Highway Engineering
With increase in speed of the traffic stream, the maximum capacity of the lane

first decreases and then increases after reaching a minimum value at optimum speed
decreases
first increases and then decreases after reaching a maximum value at optimum speed
increases

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