Highway Engineering
The direct interchange ramp involves

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

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Highway Engineering
Length of a vehicle affects

clearance to be provided under structures such as overbridges, under-bridges etc.
width of shoulders and parking facilities
width of traffic lanes
extra width of pavement and minimum turning radius

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