In many cities the "walk" only shows when the cars have a green light AND a red no-left-turn signal, to protect pedestrians from getting hit by left-turning car

In many cities the "walk" only shows when the cars have a green light AND a red no-left-turn signal, to protect pedestrians from getting hit by left-turning cars. In yet other cities and intersections cars in all directions are stopped and pedestrians in all directions are allowed to go.