Highway Engineering
Centre line markings are used

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

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Highway Engineering
Length of a vehicle affects

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

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