A serious crash on Auckland’s Southern Motorway near Takanini has left one person critically injured. Three vehicles were involved, resulting in the closure of all northbound lanes between Papakura and Takanini. The Papakura on-ramp remains closed, and motorists are advised to divert through Great South Road. The crash occurred at around 9.40am, and the serious crash unit is currently at the scene. Police are warning of potential delays for motorists in the area.