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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Highway Engineering
The direct interchange ramp involves

diverging to the right side and merging from left
diverging to the right side and merging from right
diverging to the left side and merging from left
diverging to the left side and merging from right

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