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
semaphore arm lowered but warner arm horizontal
both arms are horizontal

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Highway Engineering
Length of a vehicle affects

extra width of pavement and minimum turning radius
width of traffic lanes
width of shoulders and parking facilities
clearance to be provided under structures such as overbridges, under-bridges etc.

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