Highway Engineering
The method of design of flexible pavement as recommended by IRC is

CBR method
group index method
Benkelman beam method
Westergaard method

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

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Highway Engineering
With increase in speed of the traffic stream, the maximum capacity of the lane

decreases
first decreases and then increases after reaching a minimum value at optimum speed
first increases and then decreases after reaching a maximum value at optimum speed
increases

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