 The busway has two lanes for 6.2 km running parallel with the eastern side of the Northern Motorway from Constellation Station at the Constellation Drive/Upper Harbour Highway interchange to Akoranga Station at the Esmonde Road interchange, from where a one-way southbound bus lane extends a further 2.5 km to south of the Onewa Road interchange, where it merges with the motorway for the Harbour Bridge.There are no dedicated bus lanes on the harbour bridge itself.Its use is limited to buses of 25+ seat capacity, emergency and maintenance vehicles, and the SkyBus North Harbour services that run between Albany and Auckland Airport.