FIG. 1 is a top, side, and front perspective view of a tread module for a horizontal walkway or stairway, showing our new design;
FIG. 2 is a top, side, and front perspective view thereof, from the side opposite that shown in FIG. 1;
FIG. 3 is a front, top, and side perspective view similar to FIG. 1 in a vertical position; and,
FIG. 4 is a front, top, and side perspective view opposite that shown in FIG. 3 and in a vertical position.