Ukuqedela okungaphezulu kubamba ukubaluleka kokusebenza kanye nobuhle bezingxenye zezimboni.Njengoba izimboni zithuthuka ngokushesha, izidingo zokubekezelelana ziya ziba nzima futhi yingakho ukuqedwa okungcono kuyadingeka emikhiqizweni enembayo.Izingxenye ezinokubukeka okukhangayo zijabulela inzuzo enkulu emakethe.