Terrace Motorway Tunnel

All that separates opposing flows of traffic is a set of double no-overtaking lines and a series of slim fixed-in-place post-style road bollards.However this proposal was shelved in the early 1970s as the rising cost of building the single tunnel ruled out duplication for the foreseeable future and the extension beyond Willis Street.In order to ensure that the tunnel continues to operate effectively the NZ Transport Agency (NZTA) is upgrading the fire fighting, lighting, ventilation and drainage systems, building new tunnel control buildings and making some earthquake safety improvements.Upgrade works were being completed by the Wellington Tunnels Alliance formed by Leighton Contractors, Sinclair Knight Merz, Aecom and NZTA.[4] In November 2024, the government announced that the NZTA had been instructed to begin the process of developing an investment case under the Roads of National Significance upgrade plan.
Wellington CityState Highway 1Wellington Urban MotorwayNew Zealand Transport AgencyTunnel clearanceWellingtoncongestionrush hourWellington Inner City BypassMount Victoria Tunnelreversible laneAuckland Harbour BridgeWellington AirportNZ Transport AgencyLeighton ContractorsSinclair Knight MerzInstitution of Professional Engineers New ZealandNew Zealand Herald