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

Spray of emulsion
Prime coat
Tack coat
Seal coat

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Highway Engineering
When the speed of traffic flow becomes zero,then

traffic density becomes zero whereas traffic volume attains maximum value
traffic density attains maximum value whereas traffic volume becomes zero
traffic density and traffic volume both attain maximum value
traffic density and traffic volume both become zero

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