TY - JOUR T1 - Colour-blind drivers and traffic signals JF - Canadian Medical Association Journal JO - CMAJ SP - 1630b LP - 1630 VL - 149 IS - 11 AU - M. G. Whillans Y1 - 1993/12/01 UR - http://www.cmaj.ca/content/149/11/1630b.abstract ER -