Minimum Highway Sign Luminance Requirements for Older Drivers

摘要

In this research, the minimum amount of luminance required by older and youngerdrivers to identify a numerical legend on yellow warning signs at night was investigated. A field study was conducted for subjective and objective evaluation of seven yellow warning signs on a simulated two-way rural highway. The signs were prepared to have different retroreflectivity values and thus providing different luminance values to the subjects.