Highway Engineering
The terrain may be classified as rolling terrain if the cross slope of land is

more than 60%
between 10% and 25%
between 25% and 60%
upto 10%

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Highway Engineering
A traffic rotary is justified where

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

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