I Look Generic (and So Does My Car)

I was stopped at a light on Woodbridge Avenue today, and I heard a short "BEEP" but I didn't think it was intended for me; at the next light, I heard the same short, lighthearted "BEEP" and I turned my head and the beep was coming from a postal truck-- the driver, an African American dude that I did not recognize, smiled, flashed me the peace sign, and then drove off . . . I think he thought I was someone else, which is understandable, as I'm pretty generic looking and I drive a gray Toyota Sienna minivan.