What are "walk" and "don't walk" signals used for?

Answer: A — To guide pedestrian crossings at intersections

"Walk" and "don't walk" signals are specifically designed to guide pedestrian crossings at intersections. These signals communicate important information to pedestrians about when it is safe to cross the street and when they should wait. The "walk" signal indicates that it is safe for pedestrians to enter the crosswalk, while the "don't walk" signal warns them to remain on the curb. This system helps enhance pedestrian safety and ensures orderly traffic flow by clearly delineating the right of way for pedestrians at key intersection points. In contrast, the other options pertain to different areas of traffic control that do not involve pedestrian signals, illustrating the specific role that "walk" and "don't walk" signals play in urban traffic management.