The push button directs the signal controller to display the "Walk" indication during the next traffic cycle (it is not instantaneous). The "Walk" display should be interpreted as instruction to start crossing the street. Once the pedestrian signal displays the flashing "Don't Walk," do not depart from the curb. During the flashing "Don't Walk" phase, enough time is provided for pedestrians to finish crossing the street. However, if walkers leave the curb and begin crossing during the flashing "Don't Walk," there may not be enough time to complete crossing before the signal changes. Another interpretation of the flashing "Don't Walk" indication is don't start crossing.