of Otago has a Wellington branch with its Wellington School of Medicine and Health. Whitireia New Zealand has large campuses in Porirua, Wellington and Kapiti; the Wellington Institute of Technology and New Zealand's National Drama school, Toi Whakaari. The Wellington area has numerous primary and secondary schools. Transport Wellington is served by State Highway 1 in the west and State Highway 2 in the east, meeting at the Ngauranga Interchange north of the city centre, where SH 1 runs through the city to the airport. There are two other state highways in the wider region: State Highway 58 which provides a direct connection between the Hutt Valley and Porirua, and State Highway 59 which follows a coastal route between Linden and Mackays Crossing and was previously part of SH 1. Road access into the capital is constrained by the mountainous terrain – between Wellington and the Kapiti Coast, SH 1 passes through the steep and narrow Wainui Saddle, nearby SH 59 travels along the Centennial Highway, a narrow section of road between the Paekākāriki Escarpment and the Tasman Sea, and between Wellington and Wairarapa SH 2 transverses the Rimutaka Ranges on a similar narrow winding road. Wellington has two motorways: the Johnsonville–Porirua Motorway (largely part of SH 1, with the northernmost section part of SH 59) and the Wellington Urban Motorway (entirely part of SH 1), which in combination with a small non-motorway section in the Ngauranga Gorge connect Porirua with Wellington city. A third motorway in the wider region, the Transmission Gully Motorway forming part of the SH 1 route and officially opened on 30 March 2022, leaves the Johnsonville-Porirua Motorway at the boundary between Wellington and Porirua and provides the main route between Wellington and the wider North Island. Bus transport in Wellington is supplied by several different operators under the banner of Metlink. Buses serve almost every part of Wellington city, with most of them running along the "Golden Mile" from Wellington railway station to Courtenay Place. Until October 2017 there were nine trolleybus routes, all other buses running on diesel. The trolleybus network was the last public system of its kind in the southern hemisphere. Wellington lies at the southern end of the North Island Main Trunk railway (NIMT) and the Wairarapa Line, converging on Wellington railway station at the northern end of central Wellington. One long-distance service leaves from Wellington: the Capital Connection, for commuters