a second road crossing of the Waimakariri River. The motorway was extended northward to Pineacres in December 1970, bypassing Kaiapoi. The Western Belfast Bypass spur opened on 31 October 2017, extending the motorway southwest to The Groynes, allowing SH 1 traffic to bypass Belfast. The extension of the Dunedin Southern Motorway has also seen changes in the highway, notably to bypass the suburbs of Fairfield and Sunnyvale. Realignments In Hamilton, SH 1N originally ran through the city centre via Te Rapa Road, Ulster Street (first agreed as an alternative to the northern end of Victoria St in 1930), Victoria Street, Bridge Street and Cobham Drive; this original route later became Hamilton Urban Route 4. In 1992, SH 1N was diverted to run through Frankton via Avalon Drive, Greenwood Street, Kahikatea Drive and Normandy Avenue. The Frankton route then became the SH 1C spur in July 2022, with SH 1N being diverted to the newly-opened Hamilton section of the Waikato Expressway. In Christchurch, SH 1S originally ran via the city centre rather than around the outskirts via Harewood. The original route was via Main North Road, Cranford Street, Sherborne Street, Bealey Avenue, Madras and Gasson Streets (north)/Barbadoes Street and Waltham Road (south), Brougham Street, the Christchurch Southern Arterial Motorway, Curletts Road, Blenheim Road, and Main South Road. The section from the Queen Elizabeth II Drive to Brougham Street is now a local road, while the remainder of the route forms parts of SH 74 and 76. Re-routing also occurred in Whangarei and Timaru, removing SH 1 from their city centres. The original route through Whangārei via Kamo Road, Bank Street, Water Street and Maunu Road was diverted via Western Hills Drive, while the original route through Timaru via Stafford and King Streets was diverted via Theodosia Street and Craigie Avenue. In 2010, the Taupō Bypass was constructed shifting the original SH 1 from the township and lakeside to the eastern outskirts of Taupō. The bypass starts at Wairakei near the existing SH 1/SH 5 intersection and finishes to the north of Taupo Airport. The concurrency with SH 5 also follows part of the bypass. In the southern South Island, several particularly twisting sections of SH 1S have been rebuilt to remove sharp bends and to generally improve road conditions. These include stretches at Normanby, near Timaru; Waianakarua; two stretches at Flag Swamp and Tumai between Palmerston and Waikouaiti; and on the