He huihuinga tēnei o ngā wāhanga hiko-ārahi e titoa ana i ngā kaiwawao ara iahiko iti (MCB) o ngā whakatauranga rerekē. He pana wehewehe, he papa-pa, he pae kūpapa me te pae whenua, kei roto katoa i te pouaka maitai mō ngā ara iahiko wāhanga-kotahi, wāhanga-toru rānei. Kei roto i ēnei he taputapu mō te tiaki, te whakawhiti me te whakahaere me te whakahaere i ngā taura me taputapu Ka whakamahia ngā papa tohatoha i roto i ngā whakaurunga tūmataiti, arumoni me ngā whakaurunga ahumahi mō te tohatoha o te mana ki ngā ara iahiko iti whakamutunga, pērā i ngā ara iahiko rama me ngā ara iahiko mana iti kua whakatauria. Ka taea te whakairi ki runga i te mata, te whakairi rānei ki runga i te tuanui me te taupoki tango me ngā hononga pakaru. i ngā taha o runga me raro mō ngā whakaurunga taura. Ka honoa ia ara-iti whakamutunga ki tētahi ara o te papa tohatoha mā te MCB. Ko te rahi o te ara iahiko MCB e whakawhirinaki ana ki te whakatauranga o te whakamutunga ngā ara iahiko iti.