I would say it's the car, not the driver, that initially attracted the attention of the officer. The fact that the driver turned out to be black was probably icing on the cake for the officer. Anyway, whites are more likely than blacks to receive a warning instead of a ticket. I had a clean record the first time I was pulled over and it was for tags that I didn't realize had expired. I was driving a nice car and two officers pulled me over, admonished me for not moving over quicker, and then questioned me like I wasn't the owner of the vehicle. One other time I was pulled over it was again a white officer whose first question was, "Is this your vehicle?" I probably messed up his day when he discovered the car was registered to me. Some white people just don't like to see a black person with nice things.