Appendix 2
Percentage Change in Reaction Time Normalized to Performance Level 2 of the Draft
European Standard for a 200 mm Diameter Signal
The following three figures show the percentage change in mean reaction time for the red, yellow and
green LED signals calculated from the best fitting curves through the mean reaction times for each
individual subject (see Appendix 1 for the curves). For the red, yellow and green LED signals, 100%
reaction time is at a luminance of 6366 cd/m2.
A2-1