Highway Engineering
For a constant value of coefficient of lateral friction, the value of required super-elevation increases with

increase in speed and with decrease in radius of curve
increase in both speed and radius of curve
decrease in speed and with increase in radius of curve
decrease in both speed and radius of curve

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Highway Engineering
A traffic rotary is justified where

space is limited and costly
number of intersecting roads is between 4 and 7
when traffic volume is more than 5000 vehicles per hour
when traffic volume is less than 500 vehicles per hour

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

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

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