R21, Johannesburg, Gauteng (2) SITE NUMBER : BB77-11 DESCRIPTION : Side B - It lies on the Albertina Sisulu Drive (R21) facing traffic traveling from O.R Tambo International airport to Pretoria. SIZE: 4.5m x 18m TRAFFIC : 6 000,000 Vehicles per month GPS CO-ORDINATES : -26.109001, 28.239043