Visual Screening of Participants A Snellen chart viewed from 6.1 meters (20 feet) was used to measure corrected Snellen static visual acuity of each participant. The illuminance at the chart face was 250 lux. ... The fifth wheel was mounted to the rear of the car by a tow bar. Instrumentation wiring from the fifth wheel was fed through the trunk to a digital readout box, mounted to a platform fitting between theanbsp;...
|Title||:||Field and laboratory studies of warning symbol sign legibility distance|
|Author||:||Frances A. Greene, A. Garcia-Diaz, J. J. Congleton, Texas Transportation Institute, Rodger J. Koppa, R. D. Huchingson, Southwest Region University Transportation Center (U.S.), R. D. Zellner, University Transportation Centers Program (U.S.)|