[acjohnson55]

Black guy here. I don't think I've ever been locked out of a cab that stopped in front of me until I stated my destination or had a cabbie refuse to take me home to Brooklyn or anywhere else. I do always make a point to get in the cab first.

However, I've had plenty of cabs mysteriously go "off duty" as they approach me. That's probably a much less risky way to avoid a trip that presumably leads to a less profitable/more dangerous destination statistically, due to my ethnicity.