These are signs of Guide.
What are the Guide signs?
Traffic signs or road signs are signs erected at the side of or above roads to give instructions or provide information to road users. The earliest signs were simple wooden or stone milestones. It is important for all drivers to know about the traffic signs or the road safety signs in order to ensure the safety of himself as well as others. Inform road users of the distance left to cover to reach a destination. Inform roads users of the alternative routes to a destination.
Hence, option D is correct.
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