Te Aranui o Te Rangihaeata – the Transmission Gully motorway connects with the existing State Highway 1 (Kāpiti expressways) just north of the Mackays Crossing Interchange.
This interchange connects Te Aranui o Te Rangihaeata – the Transmission Gully motorway via State Highway 58 to the Hutt Valley in the east and Paremata in the west, around the Pāuatahanui Inlet.
The Waitangirua Interchange connects the communities of Whitby and Waitangirua with the motorway, via two new link roads: Waitangirua Link Road and Te Ara Kapehu.