Highway Engineering
Centre line markings are used

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

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

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

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