Final answer:
Option A. is correct. A sign approaching a divided highway with a median usually indicates that no left turns or U-turns are allowed. It is crucial for traffic safety to follow these instructions. Additionally, traffic signals help control the flow and ensure safety for all road users.
Step-by-step explanation:
When approaching a divided highway where opposite traffic is separated by a median island, the sign indicates that the highway is divided and typically warns that no left turns or U-turns are allowed. This helps keep traffic flowing smoothly and prevents accidents caused by vehicles attempting to turn across the path of oncoming traffic. It's important for drivers to obey these signs for their own safety and the safety of others.
Signs indicating a divided highway alert drivers to changes in the road layout and ensure that drivers are aware of the appropriate actions to take in response to these changes. Traffic signals often support this by controlling the flow of traffic, making certain maneuvers like turning and crossing safe during the designated phases of the lights.