Highway Engineering
Centre line markings are used

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

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Highway Engineering
The entrance and exit curves of a rotary have

different radii and different widths of pavement
equal radii but pavement width is more at entrance than at exit curve
equal pavement widths but radius is more at entrance curve than at exit curve
equal radii and equal widths of pavement

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