What does this signal at a crossing indicate?

• Pedestrians should start crossing.
• Pedestrians should keep walking.
• Pedestrians should stop and not cross the road.
  Explanation:

  "This signal warns that the "Don't Walk" phase is about to begin, and pedestrians should not enter the crosswalk. If they are already in the crosswalk when the signal starts flashing, they should continue to the other side as quickly and safely as possible."
• Pedestrians have the right of way.