Ko te whakamahi whānui i ngā ara iahiko tauhōu i te hauwhā whakamutunga o te rau tauwhitinga 20 i honoa ki ngā aorangi whakawhitiwhiti, i puta ai ki tētahi hurihanga i roto i ngā hangarau mōhiohio me te pikinga ake o te ipurangi huri noa me te rorohiko pūkoro, tae atu ki ngā kaitiaki rorohiko.