Le yunithi ngumshini wokuhamba we-cartical-mpo kuphela owenzelwe ukuhambisa ngokuqhubekayo ukulayisha indlela efanayo ne
thikaphela amandla
. Edinga isikhala sokufaka esingaphansi kwe-sloping, umthamo wayo uphezulu kwesigaba sokuhambisa mpo ejwayelekile, okufaka isandla ekuthuthukisweni okukhulu ekusebenzeni kahle kwabasebenzi ngenxa yeyunithi’Amandla okudlulisa amavolumu amakhulu we-cargo ngenxa yesikhathi esifushane.