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

Figure 4

Increased vehicle driving distances associated with increases in hazard target visibility as the warning beacon was changed from the unshielded to the beam distribution, for several modeled fog scenarios. Asterisks () indicate that the hazard target was invisible for the unshielded distribution, but the increase in luminance contrast with the beam distribution would substantially increase the resulting stopping distance.