Highway Engineering
In highway construction, rolling starts from

One side and proceed to other side
Sides and proceed to center
Any of the above
Center and proceed to sides

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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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Highway Engineering
Length of a vehicle affects

width of traffic lanes
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

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