Twenty subjects made 1,100 judgments in the laboratory on the identifiability of a circle, triangle, square and rectangle of solid and open configurations at low luminance levels. The rectangle was the most identifiable with the triangle, square and circle following in order. The open configuration was almost as visible as the solid which had twice as much reflective sheeting in it. Six subjects made over 360 dynamic observations from an automobile. The various reflectorized shapes were detected at an average of 801 ± 21.4 ft while the normal white helmet was detected at 243 ± 143 feet. Recognition distance of the open triangle was the greatest, with the open circle, open square, open rectangle, total reflectorized helmet and no reflectorization following in that order.