Highway Engineering
The direct interchange ramp involves

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

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Highway Engineering
Length of a vehicle affects

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

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