As a red-green color blind dude, I can tell the different between red vs. green lights or say poison ivy vs. weeds. But sometimes I get confused.
Did you ever pull over the wrong car based on color?
I always had a harder time with the new LED green traffic lights and the old, white street lights. Say, on Route 22 late at night. But when they cycled to yellow or red, I could see it fine.
No. But the guys I worked with knew to give me other info. Dark or light colored, or better...make and model or partial plate or something. If I called in a vehicle description, I usually just said light or dark unless it was white, bright red, black, or something obvious. Being a car guy, it was usually make and model anyways.