29 Feb '08 06:26>1 edit
I was driving down the street on an uneventful morning, and I drove past an ordinary traffic light that appeared green to me (wavelength 530nm). Suddenly a policeman came behind me, pulled me over, and told me I ran a red light (wavelength 650nm). I assured him that I saw a green light, but he was convinced it was red. I told him it must have been a Doppler shift that made the light look green to me; after all, I was approaching it. So he waived the red light charge, but gave me a ticket for a different reason. How fast was I going (mph)?