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

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

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Highway Engineering
In case of summit curves, the deviation angle will be maximum when

an ascending gradient meets with a level surface
an ascending gradient meets with a descending gradient
an ascending gradient meets with another ascending gradient
a descending gradient meets with another descending gradient

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