Highway Engineering
Bitumen of grade 80/100 means

its penetration value is 8 to 10 mm
its penetration value is 8 mm
its penetration value is 8 to 10 cm
its penetration value is 10 mm

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

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

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