Highway Engineering
With increase in speed of the traffic stream, the minimum spacing of vehicles

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

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Highway Engineering
In soils having same values of plasticity index, if liquid limit is increased, then

Compressibility, permeability and dry strength increase
Compressibility, permeability and dry strength decrease
Compressibility and permeability increase and dry strength decreases
Compressibility and permeability decrease and dry strength increases

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Highway Engineering
A traffic rotary is justified where

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

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Highway Engineering
The provision of traffic signals at intersections

reduces right angled and rear end collisions
reduces rear end collisions but may increase right angled collisions
reduces right angled collisions but may increase rear end collisions
increases right angled and rear end collisions

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