The ornamental design of platform barrier for visually impaired pedestrians, as shown and described.
FIG. 1 is a top, front, left-side perspective view of the four vertical post elevated platform, level boarding barrier with four vertical posts showing my design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a left end elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a right end elevation view thereof; and,