Highway Engineering
The function of an expansion joint in rigid pavements is to

Resist stresses due to expansion
Allow free expansion
Relieve shrinkage stresses
Relieve warping stresses

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Highway Engineering
A traffic rotary is justified where

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

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Highway Engineering
Length of a vehicle affects

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

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

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

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