R21, OR Tambo International Airport (B) SITE NUMBER : BB77-02 DESCRIPTION : Side B - Situated at the entrance of O R Tambo International Airport along R21 facing Traffic travelling from the Airport, Kempton Park and Pretoria to Boksburg. SIZE: 12m x 9m TRAFFIC : 4 500,000 Vehicles per month GPS CO-ORDINATES : -26.134018, 28.225529