N12 Southern Bypass (South Africa)

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National route N12 shield

National route N12
Route information
Length12.8 mi (20.4 km)
Major junctions
West end N1 Diepkloof Interchange
  M1 Uncle Charlies Interchange
M17 Xavier Street, Ridgeway
M7 Kliprivier Drive, Suideroord
M11 Comaro Street, Oakdene
R59 Reading Interchange, Alberton
R103 Voortrekker Road, Alberton
east end N3 Elands Interchange, Germiston
Highway system
Numbered routes of South Africa

The N12 Southern Bypass is a section of the Johannesburg Ring Road located in the city of Johannesburg, South Africa. The freeway was the last section of the Ring Road to be built, with the final section opening in 1986. It was initially called the N13. From the west, the Southern Bypass begins at the Diepkloof Interchange, where it splits from the N1 freeway. It ends at the Elands Interchange, where it merges with the N3 freeway. The exits include the M1 Uncle Charlies Interchange (North Eastbound only), M17 Xavier Street, R556 Kliprivier Drive, M11 Comaro Road, R59 Reading Interchange, and R103 Voortrekker Road (Alberton).


As with the N1 Western Bypass, the freeway was built with concrete between Reading and Diepkloof and has always been three lanes wide in either direction, fanning out into four lanes at Reading. The freeway passes through a declared green belt area to the south of Johannesburg, which has prevented the construction of billboards along the roadside, a common practice in the city.