R21 highway, Cornwall hill, Doornkloof SITE NUMBER : BB127-55 DESCRIPTION : R21 highway - travelling from Kempton Park & ORT airport towards Pretoria. Between Nelmapius rd & Olifantsfontein rd off ramps. SIZE: 8m x 32m TRAFFIC : 180 000 /day GPS CO-ORDINATES : -25.907428, 28.257239