What is the most recent completed business or investment case for each Road of National Significance, including its date and latest total cost estimate?

Answer

Belfast to Pegasus: Investment Case Nov 2024. Investment envelope (Nov 2024) $0.8-1 billion Mill Road Stage 1: Investment Case April 2025 Investment envelope (April 2025) $1.75-2.05 billion Tauriko West: Investment Case April 2025 Investment envelope (April 2025) $2.8-3.3 billion Hope Bypass: Investment Case August 2025. Investment envelope (Aug 2025) $1.1-1.4 billion East-West Link: Investment Case August 2025. Investment envelope (Aug 2025) $3.7-4.1 billion Petone to Grenada: Investment Case August 2025. Investment envelope (Aug 2025) $2.1-2.6 billion Wellington Improvements: Investment Case August 2025. Investment case (Aug 2025) $2.9-3.8 billion Hawke’s Bay Expressway: Investment Case August 2025. Investment envelope (Aug 2025) $0.6-0.7 billion Hamilton Southern Links: Investment Case Sept. 2025. Investment envelope (Sept 2025) $2.32-2.72 billion Te Hana to Whangarei (incl. Alt to Brynderwyn Hills): Investment Case August 2025. Investment envelope (Aug 2025) $15.3-18.3 billion Warkworth to Te Hana – Implementation case 2025. Project cost $3.65 billion (NPV) Cambridge to Piarere: Detailed Business Case 2021. Cost envelope (2026) $1.9-2.2 billion Otaki to North of Levin: Detailed Business Case 2022. Cost estimate (2025) $2.1 billion Takitimu North Link Stage 1 (Progressed from 2016 wider DBC). The current total cost estimate for Takitimu North Link Stage 1 is $884m Takitimu North Link Stage 2 (Progressed from 2017 wider DBC) Cost information is currently commercially sensitive. SH16 North-West Alternative Highway: Detailed Business Case 2021. No detailed cost estimate has been completed.