Highway Engineering
The fundamental factor in the selection of pavement type is

type and intensity of traffic
climatic condition
subgrade soil and drainage conditions
availability of funds for the construction project

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Highway Engineering
A traffic rotary is justified where

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

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