Highway Engineering
When semaphore and warner are installed on the same post, then the stop indication is given when

both arms are horizontal
semaphore arm lowered but warner arm horizontal
None of these
both semaphore and warner arms lowered

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

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

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