R21, OR Tambo International Airport (2) SITE NUMBER : BB77-07 DESCRIPTION : Side B - Situated at the entrance of O R Tambo International Airport along R21 facing Traffic travelling from Boksburg and Johannesburg to the Airport, Kempton Park and Pretoria. SIZE: 12m x 9m TRAFFIC : 4 500,000 Vehicles per month GPS CO-ORDINATES : -26.123200, 28.232552