Highway Engineering
The desirable length of overtaking zone as per IRC recommendation is equal to

overtaking sight distance
five times the overtaking sight distance
two times the overtaking sight distance
three times the overtaking sight distance

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Highway Engineering
The entrance and exit curves of a rotary have

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

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Highway Engineering
Centre line markings are used

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

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