Highway Engineering
The sequence of four stages of survey in a highway alignment is

reconnaissance, map study, preliminary survey and detailed survey
preliminary survey, map study, reconnaissance and detailed survey
map study, preliminary survey, reconnaissance and detailed survey
map study, reconnaissance, preliminary survey and detailed survey

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Highway Engineering
A traffic rotary is justified where

number of intersecting roads is between 4 and 7
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

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