&sq=&lang=&file=File:Schild_B1_NA.svg) | ||||
|---|---|---|---|---|
&sq=&lang=&file=File:Map_NAM_B1.svg) Map of the B1. | ||||
| Route information | ||||
| Maintained by Roads Authority Namibia | ||||
| Length | 1,467 km (912 mi) Excluding the 74-kilometre (46 mi) central section designated  A1 since 2017. | |||
| Southern section | ||||
| Length | 802 km (498 mi) | |||
| South end |  N7 at the South African border at Noordoewer | |||
| Major intersections |  B3 at Grünau B4 near Keetmanshoop | |||
| North end |  A1 / B6 in Windhoek | |||
| Northern section | ||||
| Length | 665 km (413 mi) | |||
| South end |  A1 / B2 near Okahandja | |||
| Major intersections |  B8 at Otavi B15 at Tsumeb B10 near Oshikango | |||
| North end | EN 120 at the Angolan border at Oshikango | |||
| Location | ||||
| Country | Namibia | |||
| Major cities | ||||
| Towns | ||||
| Highway system | ||||
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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 route exists in two discontinuous sections: a southern 802-kilometre (498 mi) section from Noordoewer to Windhoek, and a northern 665-kilometre (413 mi) section from Okahandja to Oshikango. The central 74-kilometre (46 mi) section between Windhoek and Okahandja, previously part of the B1, was upgraded to freeway standard beginning in the 1970s and continuing to 2022, with the freeway sections now carrying the designation of A1.
The entirety of the B1, together with the former section of B1 now designated A1, forms part of the Tripoli-Cape Town Highway. The section between Okahandja and Otavi is part of the Walvis Bay-Ndola-Lubumbashi Development Road, and the former section of B1 now designated A1 from Okahandja to Windhoek forms part of the Trans-Kalahari Corridor.