What indicates a pedestrian crossing?

A pedestrian signal is specifically designed to indicate when it is safe for pedestrians to cross the street. These signals often use symbols or wording such as "Walk" or "Don't Walk" to provide clear instructions to pedestrians. When the pedestrian signal displays a "Walk" indication, it means that it is safe for pedestrians to enter the crosswalk and cross the roadway. Conversely, if it shows a "Don't Walk" indication, pedestrians should wait until it is safe to cross.

This creates an organized and safe environment for both pedestrians and vehicles, as it helps to manage traffic flow by designating specific times when pedestrians have the right of way. The other options do not serve the same purpose; a stop sign indicates a halt for vehicles, concrete barriers are meant for separation and protection, and a speed bump is a traffic-calming measure but does not specifically indicate a crossing.