What does this sign indicate?

• The area ahead has increased speed limits.
• There is a school zone ahead.
• The area ahead is reserved for pedestrian crossings.
• The area ahead is unsafe for passing, and thus it is prohibited.
  Explanation:

  "This sign warns drivers that the area ahead is a no-passing zone, often due to limited visibility, curves, hills, or other road conditions that make overtaking unsafe. Drivers must remain in their lane and avoid attempting to pass other vehicles to ensure the safety of everyone on the road."