R21 Highway, Doornkloof, Tshwane (B) SITE NUMBER : BB18-102 DESCRIPTION : Facing traffic travelling on the R21 Highway in a Northerly direction from O.R. Tambo International Airport towards Pierre van Reyneveld Interchange, Tshwane CBD. SIZE: 15m x 60m TRAFFIC : 1 194 800 per month GPS CO-ORDINATES : -25.888175, 28.255733