What does this sign indicate?

• Cyclists should always ride on the sidewalk.
• Cyclists are not allowed on this road.
• Cyclists may occupy the full lane, and drivers should be cautious and yield to them.
  Explanation:

  "This sign indicates that cyclists may occupy the full lane, and drivers should be cautious and yield to them. This sign is used on roads where lanes are too narrow for bicycles and vehicles to safely share side-by-side, reminding drivers to watch out for cyclists using the full lane."
• All lanes are reserved exclusively for cyclists.