Highway Engineering
Centre line markings are used

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

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Highway Engineering
A traffic rotary is justified where

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

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