In Atlanta, you're either "ITP" or "OTP." The P stands for the Perimeter*. What three number designation denotes Atlanta's perimeter? In 1982, Braves pitcher Pascual Perez famously missed a start because he kept driving around Atlanta on this Interstate looking for the stadium, earning him the nickname "Perimeter Pascual" (he ran out of gas during the search and made it to the ballpark ten minutes late). *For those who don't speak Southern, you call these "beltways." :)
I-285