%0 Journal Article
%A Robert D Clear
%A Sam M Berman
%B Journal of the Illuminating Engineering Society
%D 1985
%G eng
%L LBL-19423
%P 167-180
%T Target Size, Visibility, and Roadway Performance
%V 15
%1 <p>Lighting Systems Group</p>
%2 LBL-19423
%X <p>Analysis of roadway tasks in terms of the CIE 19/2 visibility parameters has beensrestricted to calculation of VL at a fixed distance because there has been no way to adjust forsthe change of apparent size with distance. We use a rough ft of the absolute threshold contrastsdata as a function of luminance and size to allow the computation of VL as a function ofsdistance. Sample VL versus distance and VL versus time calculations are presented. Aspreliminary estimate of detection probability as a function of time is compared to Gallagherssmeasured results to see how current detection models compare to real results.</p>