It means the road ahead is an one way road
It means you aren't allowed to enter here!
It means you can't bring food here!
It means you can't bring alcohols here!
It means you can't use smartphones here!
It means you can't throw garbage here!
It means you can't take photo (picture) here
It means the max speed limit is 40 km/h
It means you can't bring pet here!
It means you can't smoke here!
It means you have to slow down!
It means you can't be noisy here!
It means there's a construction site ahead