What does this sign indicate?

• Buses are prohibited from entering the road.
• Drivers should expect buses merging onto the road from the specified side.
  Explanation:

  "This sign warns drivers of a bus entrance ahead on the specified side of the road, indicating that buses may be merging into traffic. Drivers should remain alert, reduce speed if necessary, and be prepared to yield to buses entering the roadway."
• Only buses can travel on this road.
• Vehicles must stop immediately for buses.