Ngaphambi kokufaka injini yomnyango ezenzakalelayo, hlola uhlobo lomnyango, isisindo samaqabunga aphelele, ububanzi bokuvula, imvamisa yethrafikhi, isikhala sokufaka esitholakalayo, ukunikezwa kwamandla, kanye nokuhambisana kokulawula. Kuhlelo lomnyango oluzenzakalelayo, injini iyingxenye eyodwa kuphela yomsebenzi: isilawuli, izinzwa, amadivayisi okuphepha...
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