Umthwalo oqengqelekayo ngumthwalo ongazange ulayishwe kwinqanawa ecwangcisiweyo ngenxa yezizathu ezahlukeneyo: ukubhukisha ngokugqithisileyo, imiba yezithethe, imiba yobunzima, utshintsho lweshedyuli yenqanawa, ukuhamba ngeenqanawa ezingenanto, imihla ebekiweyo ephosiweyo, iinkxalabo ngoomatshini, okanye iingxaki ngamaxwebhu.
Ngokuxhomekeke kwizona zizathu ezibangele umthwalo oqengqelekayo, kunokwenzeka ukuba ubekwe kwinqanawa elandelayo ekhoyo kodwa konke kuxhomekeke kwisikhephe okanye kumqhubi wenqwelo-moya yomthwalo. Naziphi na iintlawulo ezongezelelweyo ezibandakanyekayo zinokuthwalwa ngabathwali ngokuzenzekelayo ukuba bekungenxa yayo nayiphi na imiba evela kubo. Ngazo naziphi na izizathu ezinxulumene nabathumeli, njengokungaphumeleli ekuthotyelweni kwamaphepha, abathumeli baya kuhlawuliswa endaweni yoko, kwaye iifizi ze-rollover zingadlula iintlawulo zokuqala zempahla.
Umthwalo ogqithiselweyo kungenzeka ukuba ube s okanye umthwalo olungiselelwe amazibuko awaziwayo kakhulu kunokwenzeka ukuba ube namava oku njengoko ngokuqhelekileyo bexhomekeke kumalungiselelo eenqanawa ezininzi kungoko benyusa umngcipheko wokuphoswa kweenqanawa zokuqhagamshela.