Colour blindness afflicts men more than women. Keep that factlet in your back pocket. Cause if you cycle properly eventually you'll be having a little chat about the rule of law with some uniformed protozoa with father issues.
He won't appreciate your perspective on the way the nanny state oppresses, so get all sciencey on his arse. How can you have known what colour that light was with your debilitating disability?
Even if it doesn't stop you getting the old baton to the back of the knees, you'll be able to crumple to the ground aware you've given him the sort of knowledge that distinguishes him from his peers and all but locks in his next promotion.
BONUS TIP: A lady cop just needs a wink from an outlaw and it'll be her going all weak at the knees.
