Highway Engineering
A traffic rotary is justified where

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

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Highway Engineering
In soils having same values of plasticity index, if liquid limit is increased, then

Compressibility and permeability decrease and dry strength increases
Compressibility, permeability and dry strength increase
Compressibility, permeability and dry strength decrease
Compressibility and permeability increase and dry strength decreases

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