The N3 is a national route in South Africa that connects Johannesburg and Durban, respectively South Africa's largest and third-largest cities. Johannesburg is the financial and commercial heartland of South Africa, while Durban is South Africa's key port and one of the busiest ports in the Southern Hemisphere and is also a holiday destination. Durban is the port through which Johannesburg imports and exports most of its goods. As a result, the N3 is a very busy highway and has a high volume of traffic.
The N21 is a proposed national route in the City of Cape Town, South Africa. It is also known as the Peninsula Expressway ring road. Once complete, it will link the northern suburbs on the Atlantic seaboard with the southern suburbs on False Bay (Muizenberg). The R300 freeway is entirely part of the proposed route.
National routes in South Africa are a class of trunk roads and freeways which connect major cities. They form the highest category in the South African route numbering scheme, and are designated with route numbers beginning with "N", from N1 to N18. Most segments of the national route network are officially proclaimed National Roads that are maintained by the South African National Roads Agency (SANRAL), but some segments are maintained by provincial or local road authorities.
The N1 is a national route in South Africa that runs from Cape Town through Bloemfontein, Johannesburg, Pretoria and Polokwane to Beit Bridge on the border with Zimbabwe. It forms the first section of the famed Cape to Cairo Road.
The R45 is a provincial route in Western Cape, South Africa that connects Saldanha with Villiersdorp via Vredenburg, Malmesbury and Paarl. The route is mostly a two-lane wide-shouldered highway, however sections within Paarl and between Vredenburg and Saldanha are dual-carriageways. The R45 is co-signed with the N7 for a short segment north of Malmesbury.
The R75 is a provincial route in Eastern Cape, South Africa that connects Graaff-Reinet with Gqeberha via Despatch, Kariega and Jansenville.
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The N2 is a national route in South Africa that runs from Cape Town through George, Gqeberha, East London, Mthatha, Port Shepstone and Durban to Ermelo. It is the main highway along the Indian Ocean coast of the country. Its current length of 2,255 kilometres (1,401 mi) makes it the longest numbered route in South Africa.
The N52 road is a national secondary road in Ireland. It links the M7 motorway from just south of Nenagh, County Tipperary to the M1 motorway north of Dundalk in County Louth. The route forms a connection between the north east of Ireland and the mid west traversing the midlands. It interchanges with the M6 at Kilbeggan and at Tyrrellspass, the N4 at Mullingar, the N3 at Kells, and the N2 at Ardee before continuing towards Dundalk.
The Walvis Bay-Ndola-Lubumbashi Development Road runs from Walvis Bay, through Rundu in north eastern Namibia, along the Caprivi Strip to Katima Mulilo on the Zambezi River, which forms the border between Namibia and Zambia. The Katima Mulilo Bridge spans the river to the Zambian town of Sesheke from where a road runs to Livingstone, joining the main north–south highway to Lusaka, connecting onwards to the Copperbelt.
The M5 is an expressway in the City of Cape Town Metropolitan Municipality, South Africa. It connects Milnerton on the Western Seaboard in the north to Muizenberg in the south, and crosses both the N1 and the N2. For part of its length, from the N1 interchange to Plumstead, it is a limited-access freeway (motorway). From Mowbray to Muizenberg it is parallel to the M4 Main Road.
The N12 is a national route in South Africa which runs from George through Beaufort West, Kimberley, Klerksdorp and Johannesburg to eMalahleni.
The N4 is a national route in South Africa that runs from Skilpadshek on the Botswana border, past Rustenburg, Pretoria, eMalahleni and Mbombela, to Komatipoort on the Mozambique border. It forms the South African section of the Trans-Kalahari Corridor, which runs from Walvis Bay to Maputo, meaning that it links the east and west coasts of Southern Africa.
The Trans-Kalahari Corridor is a paved highway corridor that provides a direct route from the port of Walvis Bay and Windhoek in central Namibia, through Botswana, to Pretoria in Gauteng province in South Africa. It initially cost approximately 850 million Namibian dollars and was officially opened in 1998.
The Tripoli–Cape Town Highway or TAH 3 is Trans-African Highway 3 in the transcontinental road network being developed by the United Nations Economic Commission for Africa (UNECA), the African Development Bank (AfDB), and the African Union. The route has a length of 10,808 km (6,716 mi) and has the longest missing links and requires the most new road construction.
The M7, also named Jakes Gerwel Drive, is a limited-access road and metropolitan route in the City of Cape Town, South Africa. It connects Acacia Park with Rocklands on the False Bay Coast via the Cape Flats.
The B1 is a national highway of Namibia, and is the country's longest and most significant road, running the length of the country from south to north. It connects Noordoewer in the south on the South African border with Oshikango in the north on the Angolan border via Namibia's capital city Windhoek.
The N14 is a national route in South Africa which runs from Springbok in the Northern Cape to Pretoria in Gauteng. It passes through Upington, Kuruman, Vryburg, Krugersdorp and Centurion. The section between Pretoria and Krugersdorp is maintained by the Gauteng Provincial government and is also designated the P158.
The N17 is a national route in South Africa which runs from Johannesburg to Oshoek (Ngwenya) on the border with Eswatini. It passes through Springs, Bethal and Ermelo.
The A1 is a national highway in Namibia. The 76 kilometres (47 mi) stretch of road between Windhoek and Okahandja is the only A-rated road in Namibia. Consisting of freeway for its entire length, it came into existence in 2017 when freeway sections of the B1 were redesignated A1 in accordance with new standards of the Roads Authority Namibia. The entirety of the A1 forms part of the Trans-Kalahari Corridor and, together with the B1, also forms part of the Tripoli-Cape Town Highway.
N1 in Cape Town 
N14 at Springbok 
B1 at the Namibian border at Vioolsdrif 
