Highway Engineering
Centre line markings are used

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

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Highway Engineering
The sequence of four stages of survey in a highway alignment is

map study, reconnaissance, preliminary survey and detailed survey
reconnaissance, map study, preliminary survey and detailed survey
map study, preliminary survey, reconnaissance and detailed survey
preliminary survey, map study, reconnaissance and detailed survey

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