Impacts of Fog Characteristics, Forward Illumination, and Warning Beacon Intensity Distribution on Roadway Hazard Visibility

Figure 3

Roadway scene renderings corresponding to low-beam forward illumination (30,000 cd), a fog visibility range of 600 m, a warning beacon intensity of 750 cd, and each spatial intensity distribution ((a) unshielded; (b) baffle; (c) beam). Each panel is an eight-bit (0–255) rendering; a pixel value of 0 (black) corresponds to a luminance of 0 cd/m² and a pixel value of 255 (white) corresponds to a luminance of 2.55 cd/m² or higher. The actual photometric simulations did not truncate the higher luminance levels.

(a)

(b)

(c)