Ububanzi bokusetshenziswa kwebhokisi lokuhlangana elingaqhumi:
I-Zone 1 kanye ne-Zone 2 umoya wegesi eqhumayo, i-Zone 20, Zone 21, kanye ne-Zone 22 imvelo yothuli oluvuthayo, i-IIA, IIB, imvelo eqhumayo yezinga le-IIC kanye neqembu lokushisa T1-T6 imvelo.