Final answer:
A flashing "don't walk" pedestrian signal indicates that pedestrians should not cross the street. They should wait for the solid "walk" signal or a green light.
Step-by-step explanation:
A flashing "don't walk" pedestrian signal indicates that pedestrians should not begin crossing the street because it's not safe to do so. This signal is typically seen at intersections with heavy traffic or where there is higher risk for accidents. When the signal is flashing, pedestrians should wait for the solid "walk" signal or a green light before crossing.