R21 Highway, Doornkloof, Tshwane (A) SITE NUMBER : BB18-101 DESCRIPTION : Facing traffic travelling on the R21 Highway, Albertina Sisulu Freeway, in a Southerly direction from Tshwane CBD, Pierre van Reyneveld Interchange towards O.R. Tambo International Airport. SIZE: 15m x 60m TRAFFIC : 1 194 800 per month GPS CO-ORDINATES : -25.888175, 28.255733