The Western Bypass is a section of the N1 and the Johannesburg Ring Road located in the city of Johannesburg, South Africa. Known at the time as the Concrete Highway, the freeway was initially opened in 1975 as a route to avoid the city centre of Johannesburg and to provide access to the western areas of the Witwatersrand. From the south, the Western Bypass begins at the Diepkloof Interchange in Soweto, where it splits from the N12 freeway and ends at the Buccleuch Interchange, where it merges with the N3 Eastern Bypass, M1 South and N1 Ben Schoeman freeways. The Western Bypass is the longest section of the Johannesburg Ring Road. The freeway is mostly four lanes wide in either direction, but fans out into six lanes between Rivonia and Buccleuch, where there is heavy traffic moving north towards Pretoria. The Western Bypass is part of the N1 road that spans the length of South Africa, which is the beginning of the famed Cape to Cairo Road. Route The southern terminus of the N1 Western Bypass begins at Diepkloof Interchange where the co-signed N12 splits off and heads east, close to the M68 Chris Hani Road overpass, as the N12 Southern Bypass. At the same interchange, the N1 meets the M12 Rand Show Road (southbound only). The Western Bypass continues north, with the suburb of Diepkloof to the west, to intersect with the M70 Soweto Highway that connects Soweto to the Johannesburg CBD (northerly off-ramp & southerly on-ramp). Continuing north, near Riverlea, it intersects with a road that is part of the proposed extension of the N17 (northerly on-ramp and southerly off-ramp). It soon crosses under the R41 near Wisbey Dip, heading north-west past the Newclare Cemetery. Here, it forms the borderline between Johannesburg to the east and Roodepoort to the west. It then intersects the R24 Albertina Sisulu Road Interchange in Bosmont. Continuing in a roughly northerly direction it passes under the M18 Ontdekkers Road before interchanging Gordon Road in Florida Glen. Heading north-west, it intersects with the M8 14th Avenue Interchange at Quellerina. Turning north-east, it passes between the suburbs of Weltevredenpark and Fairland. Here, it intersects with the M5 (Beyers Naudé Drive) Interchange near Randpark Ridge. Continuing north-east, it crosses under the M6 Ysterhout Drive in Bromhof. Continuing northwards, it intersects the R512 (Malibongwe Drive) Interchange in Strijdompark. The N1 continues north-east through the northern suburbs of