What does this sign mean?

• Drivers cannot park in the area between these signs.
  Explanation:

  "A "No Parking" sign with arrows pointing both ways marks a zone where parking is prohibited to keep the area clear for traffic flow or other purposes."
• Drivers must not stop their vehicle in the area between these signs.
• Drivers can park their vehicles in the area between these signs.
• Only bicycles can park in the area between these signs, not four-wheel vehicles.