Intshayelelo: Iitrektara ezizimelayo ezikrelekrele zisekwe kwindawo ekumgangatho ophezulu, ucwangciso lwendlela, kunye nobuchwepheshe bolawulo, oluphumeza ngokwenene ukusebenza okude ngaphandle komntu. Xa kuthelekiswa neetrektara eziqhelekileyo, ziphelisa umonakalo wengxolo, ukungcangcazela, ukuchanabeka elangeni, nothuli kumzimba walowo uzisebenzisayo, nto leyo eyenza ukuba umsebenzi wonge kwaye ukhuseleke ngakumbi. Kwangaxeshanye, uhlengahlengiso lwesantya sokusebenza ngobukrelekrele kunokuphucula ngokufanelekileyo uqoqosho lwamafutha kunye nokusebenza kakuhle ngokulungelelanisa isantya sokusebenza ngokufanelekileyo ngokweemeko ezahlukeneyo zokusebenza.