What does this sign mean?

• Pedestrians and bicycles are allowed to use the designated area.
• Pedestrians and bicycles are not allowed to use the designated area.
  Explanation:

  "This sign indicates that neither pedestrians nor bicycles are allowed in the specified area. This restriction is typically enforced for safety reasons, such as on highways, bridges, or certain restricted zones where both pedestrians and cyclists may be at risk due to high-speed or heavy vehicle traffic."
• Pedestrians and bicycles are allowed only during certain hours.
• Pedestrians and bicycles must yield to other traffic.