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

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

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

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

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