I worked for Mabstoa back in early 2000s and resigned for personal reasons. I'm hoping the color blindness test won't be an issue for me since I am on the 4600 list. When I went for the medical I failed the test and had to go to a doctor to sign me off as fit to drive with CDL. When I went back to the medical department they had me retake the test, of course same results, and then brought me to a seperate room with a traffic light. They asked me what colors each were and I was then passed as fit to drive.