This chapter summarizes the development and the impact of the Auckland Northern Busway (New Zealand(NZ)) along with connecting bus routes and associated services (collectively referred to as ‘the busway’). The busway is a highly significant project in a NZ context, being the only segregated busway in NZ and one of the most substantial public transport projects implemented in NZ within the past 50 years. The chapter describes the impacts of the busway on bus patronage, bus travel times and traffic volumes and conditions on the adjacent main arterial highway. It highlights the important role of segregated (‘rapid transit’) modes in catering for peak-period travel demand to/from the Auckland central business district and outlines the contribution of the busway to accommodating travel demand increases in the northern corridor. Current busway-related issues and future plans are reviewed, including options for further segregation in the city centre and/or potential conversion of the busway to light rail as a means of accommodating anticipated further increases in travel demand in the corridor. Some wider implications of the busway development are also outlined.