Boksburg, R21 & N12 Interchange (A) SITE NUMBER : BB100-07 DESCRIPTION : At the R21 & N12 Interchange: Facing busy traffic travelling from O.R. Tambo into Boksburg via the N12. Drivers left, next to Volvo Industrial Equipment Supplier SIZE: 8m x 30m TRAFFIC : 1 800 000 Vehicles per month GPS CO-ORDINATES : -26.169944, 28.231556