Highway Engineering
Centre line markings are used

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

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Highway Engineering
In case of summit curves, the deviation angle will be maximum when

a descending gradient meets with another descending gradient
an ascending gradient meets with another ascending gradient
an ascending gradient meets with a descending gradient
an ascending gradient meets with a level surface

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