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

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

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Highway Engineering
Centre line markings are used

to designate traffic lanes
to designate proper lateral placement of vehicles before turning to different directions
to indicate that overtaking is not permitted
in roadways meant for two way traffic

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