Highway Engineering
When the bituminous surfacing is done on already existing black top road or over existing cement concrete road, the type of treatment given is

Prime coat
Tack coat
Seal coat
Spray of emulsion

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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
to designate traffic lanes
in roadways meant for two way traffic

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