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Integrated Transport Assessment State Highway 1 – Johns Road (The Groynes to Sawyers Arms Road)

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Integrated Transport Assessment State Highway 1 – Johns Road (The Groynes to Sawyers Arms Road) Integrated Transport Assessment State Highway 1 – Johns Road (The Groynes to Sawyers Arms Road) Prepared for NZ Transport Agency April 2013 SH1 Johns Road (The Groynes to Sawyers Arms Road) Integrated Transport Assessment Executive Summary This Integrated Transport Assessment (ITA) provides a full appraisal of the multi-modal transportation effects of the proposed State Highway 1 – Johns Road: The Groynes to Sawyers Arms Road improvement project. The improvements proposed along this 4km section of State Highway are part of the Western Corridor improvements, which in turn form part of the Christchurch Motorways suite of projects being undertaken by the NZ Transport Agency within the Roads of National Significance programme. The Groynes to Sawyers Arms Road (G2S) upgrade includes 4-laning the entire project length, including the provision of central median and wire rope barrier, improved road cross section, wide sealed shoulders and improved street lighting and stormwater management. This ITA considers the safety and operational impacts of the proposals. The CAST transportation model is used to assess the likely impact of the proposals including comparison with the do-minimum approach. The 2006 and 2011 base years are used and compared against the 2026 and 2041 horizon years. The modelling demonstrates that, operationally, there are significant positive effects in upgrading G2S as opposed to continuing with the current arrangement along this section of the corridor. A number of turning movements are prevented as part of the G2S project – however, interestingly, it is demonstrated that without G2S upgrade the local road network in the vicinity of the G2S project length would suffer significant negative effects. This is because G2S upgrade is critical to the efficient operation of SH1, as well as the wider road network, and without upgrading this section there would be considerable congestion which would likely result in traffic diverting to inappropriate local roads. The proposed project will assist in improving the operation and Level of Service of State Highway 1 and consequently the movement of people and freight, thereby supporting the key government objectives to improve productivity and economic growth (as well as improving access to a key tourism gateway). The ITA also considers sustainable modes and it is established that the proposals contained within the G2S project will provide some improvements for pedestrians and cyclists. It is therefore concluded that the G2S project is a critical element of the infrastructure improvements being proposed in this locality and will bring about benefits that support the wider national and regional goals for transport. Status: Final April 2013 Project number: Z1818001 Our ref: Johns ITA revC FINAL.docx SH1 Johns Road (The Groynes to Sawyers Arms Road) Integrated Transport Assessment NZ Transport Agency Johns Road G2S Integrated Transport Assessment CONTENTS Executive Summary ......................................................................................................................... i 1 Introduction .............................................................................................................................. 1 1.1 Background ......................................................................................................................... 1 1.2 Project Description ............................................................................................................... 1 1.2.1 Christchurch Western Corridor........................................................................................ 1 1.2.2 The Groynes to Sawyers Arms Road Four Laning ............................................................ 1 1.3 National Context .................................................................................................................. 2 2 Planning & Funding Context ...................................................................................................... 3 2.1 National Framework ............................................................................................................. 3 2.1.1 Government Policy Statement 2012 ................................................................................ 3 2.1.2 National Land Transport Programme 2012-2015 .............................................................. 3 2.1.3 State Highway Asset Management Plan 2012-15 ............................................................. 3 2.2 Local Framework ................................................................................................................. 3 2.2.1 Canterbury Regional Land Transport Strategy 2012-2042 ................................................. 3 2.2.2 Greater Christchurch Transport Statement (GCTS) .......................................................... 4 2.2.3 Christchurch Transport Strategic Plan (CTSP) 2012-2042 ................................................ 4 3 Existing Situation...................................................................................................................... 4 3.1 Network Description ............................................................................................................. 4 3.2 Existing Network Issues ....................................................................................................... 6 3.3 Non-Car Modes ................................................................................................................... 6 3.3.1 Public Transport ............................................................................................................ 6 3.3.2 Walking & Cycling .......................................................................................................... 6 3.4 Safety Analysis .................................................................................................................... 6 3.4.1 State Highway 1 ............................................................................................................ 6 3.4.2 Local Road Network....................................................................................................... 8 4 Future Scenario ....................................................................................................................... 9 4.1 Assessment Years ............................................................................................................... 9 4.2 Model Output Data ............................................................................................................... 9 5 Assessment of Traffic Impacts ................................................................................................... 9 5.1 Base Year 2006 ................................................................................................................... 9 5.2 2011 Post Earthquake Traffic .............................................................................................. 10 5.2.1 Intersection LoS .......................................................................................................... 10 5.2.2 Link Delay ................................................................................................................... 12 5.2.3 Link Saturation ............................................................................................................ 12 Status: Final April 2013 Project No.: Z1818001 Our ref: Johns ITA revC FINAL.docx SH1 Johns Road (The Groynes to Sawyers Arms Road) Integrated Transport Assessment 5.3 2026 Design Year .............................................................................................................. 13 5.3.1 2026 Intersection LoS AM Period .................................................................................. 13 5.3.1.1 Johns Road / Sawyers Arms Roundabout ............................................................... 14 5.3.1.2 Johns Road / Wilkinsons Road Intersection ............................................................ 15 5.3.1.3 Johns Road / Greywacke Road Intersection ........................................................... 15 5.3.1.4 Johns Road / Gardiners Road Intersection ............................................................. 16 5.3.1.5 Johns Road / Clearwater Roundabout .................................................................... 17 5.3.1.6 Gardiners Road / Wilkinsons Road Intersection ...................................................... 18 5.3.1.7 Gardiners Road / Hussey Road Intersection ........................................................... 18 5.3.1.8 Gardiners Road / Sawyers Arms Road Intersection ................................................. 18 5.3.2 Link Flows 2026 AM Peak ............................................................................................ 19 5.3.3 2026 Intersection LoS PM Period .................................................................................. 19 5.3.3.1 Johns Road / Sawyers Arms Roundabout Intersection............................................. 20 5.3.3.2 Johns Road / Wilkinsons Road Intersection ............................................................ 20 5.3.3.3 Johns Road / Greywacke Road Intersection ........................................................... 21 5.3.3.4 Johns Road / Gardiners Road Intersection ............................................................. 22 5.3.3.5 Johns Road / Clearwater Intersection ..................................................................... 22 5.3.3.6 Gardiners Road / Wilkinsons Road Intersection
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