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
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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