Highway Engineering
A traffic rotary is justified where

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

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Highway Engineering
The effect of grade on safe overtaking sight distance is

to decrease it on descending grades and to increase it on ascending grades
to decrease it on both descending and ascending grades
to increase it on descending grades and to decrease it on ascending grades
to increase it on both descending and ascending grades

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Highway Engineering
Centre line markings are used

to designate traffic lanes
to designate proper lateral placement of vehicles before turning to different directions
in roadways meant for two way traffic
to indicate that overtaking is not permitted

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

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

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