Highway Engineering
Length of a vehicle affects

extra width of pavement and minimum turning radius
clearance to be provided under structures such as overbridges, under-bridges etc.
width of shoulders and parking facilities
width of traffic lanes

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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
number of intersecting roads is between 4 and 7
space is limited and costly

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