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

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

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Highway Engineering
A traffic rotary is justified where

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
space is limited and costly

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