Highway Engineering
With increase in speed of the traffic stream, the minimum spacing of vehicles

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

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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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