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

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Highway Engineering
Centre line markings are used

to designate proper lateral placement of vehicles before turning to different directions
to indicate that overtaking is not permitted
to designate traffic lanes
in roadways meant for two way traffic

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