Highway Engineering
Length of a vehicle affects

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

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Highway Engineering
Centre line markings are used

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

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