ENingizimu Afrika eminye imigwaqo ibekwa njengemizila enezinombolo yokusiza ekuzulazuleni. Kukhona uhlelo lokubala izinombolo ezweni lonke olunemizila kazwelonke, yesifundazwe neyesifunda, futhi ezindaweni ezahlukene zasemadolobheni kunezinhlelo zemigwaqo yamadolobha amakhulu. Ohlelweni lukazwelonke lwezinombolo, imizila yehlukaniswe ngezigaba ezintathu: imizila kazwelonke, okuyizindlela ezibaluleke kakhulu ezibandakanya amadolobha amakhulu; imizila yesifundazwe, exhuma amadolobha amancane namakhulu kunethiwekhi yomzila kazwelonke; nemizila yesifunda, exhuma amadolobha amancane kunethiwekhi yomgwaqo. Izinombolo zemizila zinikezwe la makilasi ngokulandelayo: Imizila kazwelonke - N1 kuye N21 Imizila yesifundazwe - R21 kuya R99 Imizila yesifunda efanayo - R101 kuya R120 (Umzila wesifunda ohambisanayo uzoba namasegmenti emigwaqo phambilini obuyingxenye yomzila kazwelonke ongu-R1xy. I-Nxy eshintshwe yimigwaqo ethuthukisiwe) Imizila yesifunda esifundazweni saseKapa sangaphambili: R300 kuya R499. Imizila yesiFunda eSifundazweni sangaphambilini seTransvaal: R500 kuye R599 Imizila yesifunda KwaZulu-Natal: R600 kuye R699 Imizila yesifunda eFree State: R700 kuya R799 Falkner, John (May 2012). South African Numbered Route Description and Destination Analysis (PDF). National Department of Transport. p. xi. Archived from the original (PDF) on 22 February 2019. Kulandwe ngomhlaka 22 February 2019.