The N4 is a national route in South Africa that runs from Skilpadshek on the Botswana border, past Rustenburg, Pretoria, Witbank and Nelspruit, 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. Since the completion of the A2 through Botswana, the entire Corridor is now a world-class standard highway; it features at least one carriageway in each direction of high-speed traffic plus a paved shoulder for its entire length.