Abstract
In order to investigate within which areas the road silhouettes, as framed by the light from a meeting car, can be of help to the driver a series of experiments has been performed. The experiments employed two stationary opposing cars standing at distances (100-400 m), determined by pre-experiments, from each other. The "iso-silhouette" curves on the area between the cars were measured, using a special method for a number of silhouette relevant conditions. Factors favouring silhouette effects were found to be: narrow road, short distance between the cars, high road surface reflectance, inner bend, the driver's eyes being high above the road, particles in the atmosphere, and large spread of the meeting headlight beams.