Highway Engineering
The most suitable equipment for compacting clayey soils is a

pneumatic tyred roller
smooth wheeled roller
vibrator
sheep foot roller

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Highway Engineering
A traffic rotary is justified where

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

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Highway Engineering
Centre line markings are used

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
to designate traffic lanes

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