Highway Engineering
Centre line markings are used

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

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Highway Engineering
A traffic rotary is justified where

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

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

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

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