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

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
decreases
increases

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Highway Engineering
The effect of grade on safe overtaking sight distance is

to increase it on both descending and ascending grades
to decrease it on both descending and ascending grades
to increase it on descending grades and to decrease it on ascending grades
to decrease it on descending grades and to increase it on ascending grades

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