Highway Engineering
Centre line markings are used

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

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Highway Engineering
A traffic rotary is justified where

space is limited and costly
when traffic volume is more than 5000 vehicles per hour
when traffic volume is less than 500 vehicles per hour
number of intersecting roads is between 4 and 7

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