Compare the stop sign on the left, which has material properties extracted from the measurement of a retroreflective paint, to the sign on the right, which has standard scattering paint. Both signs are illuminated by a car’s headlights at a distance of 50 meters. The retroreflectivity level is clearly higher for the sign on the left. In addition, you can distinguish the retroreflective lob effect (left side of the road sign) compared to the regular diffused component of the paint BRDF.
Using the portable Mini-Diff V2, it is easy to gauge the visibility of traffic signs from different angles and distances. This can be useful for assessing the deterioration of an existing sign, choosing the best location for a sign, or evaluating the quality of retroreflective paint during manufacturing.