Tailorable truncated retroreflector array (TTRA) technology can be used to design safety and hazard signage that has either a single three-dimensional reflective surface that provides visibility at view angles over a 180° (i.e., 90° to -90°) field of view or has three or more three-dimensional reflective surfaces that provide visibility at view angles over a 360° field of view. Because the arrays making up the signage have both corner reflector portions and light-redirecting portions, which extend beyond the corner reflector portions and redirect light in deterministic directions including into corner reflector portions, the signage is visible from substantially small glancing angles. Figure 1 shows four pictures of a three-sided sign taken at four different glancing angles approaching -90° relative to one of the sides of the sign.

Figure 1. Pictures of a three-sided sign taken at different view angles approaching -90°

Figure 1. Pictures of a three-sided sign taken at different view angles approaching -90°

Figure 2 depicts two variations of a triangular pyramid-shaped hazard marking buoy intended for marking underwater hazards, which can provide visibility to boaters approaching the hazard from any direction.

Figure 2. Triangular pyramid-shaped hazard marking buoy prototypes.

Figure 2. Triangular pyramid-shaped hazard marking buoy prototypes.

Figure 3 shows a picture of a four-sided hazard marker having triangular pyramid-shaped light-redirecting portions surrounded by corner reflector portions as indicated by the dashed lines. The corner reflector portions of the hazard marker can be seen having a brighter ‘glow’ because they each retroreflect light from the camera flash back to the camera including light redirected into them by light redirecting portions.

Figure 3. Square pyramid-shaped hazard sign with dashed lines indicating a light-redirecting portion and surrounding corner reflector portions

Figure 3. Square pyramid-shaped hazard sign with dashed lines indicating a light-redirecting portion and surrounding corner reflector portions