Core Strategy
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St Austell Transport Strategy Development Appendix A – Highways Strategy Report May 2017 St. Austell Area Transport Modelling: Highways Strategy Report Cornwall Council September 2011 St. Austell Area Transport Modelling: Highways Strategy Report WHV285300DL/5/3 Prepared for Cornwall Council Carrick House Truro Cornwall TR1 1EB Prepared by Parsons Brinckerhoff The Forum Barnfield Road Exeter EX1 1QR 01392 229700 www.pbworld.co.uk Report Title : Highways Strategy Report Report Status : Final Version Job No : WHV285300DL Date : September 2011 Prepared by : Checked by : Approved by : Document History and Status Report Date of Prepared By: Checked By: Approved By: Issue Issue 1 28/04/11 2 15/06/11 3 21/09/11 AUTHORISATION SHEET Client: Cornwall Council Project: St. Austell Transport Modelling PREPARED BY Name: Position: Regional Associate, Transportation Planning / Transportation Planner Date: September 2011 AGREED BY Name: Position: Regional Associate, Transportation Planning / Transportation Planner Date: September 2011 AUTHORISED FOR ISSUE Name: Position: Regional Associate, Transportation Planning Date: September 2011 DISTRIBUTION ACCEPTED BY Name: Position: Transportation, Cornwall Council Date: September 2011 CONTENTS Page 1 INTRODUCTION 1 1.1 Background 1 1.2 St. Austell, St. Blazey and China Clay Area Regeneration Plan 1 1.3 St. Austell and China Clay Area Eco-Communities 1 1.4 Connecting Cornwall: 2030 2 1.5 St. Austell Area Transport Model 2 1.6 Previous Reports 2 1.7 Purpose of Report 2 1.8 Key Locations 4 1.9 Strategic Road Network 5 2 SUMMARY OF EXISTING CONDITIONS 6 2.1 Introduction 6 2.2 Traffic Flow Analysis 6 2.3 Seasonality 10 2.4 Summary 12 3 FUTURE DEVELOPMENT 13 3.1 Introduction 13 3.2 Eco Communities 13 3.3 Development Phasing 15 3.4 Sustainability 15 4 ECO-COMMUNITY TRANSPORT SCHEMES 16 4.1 Introduction 16 4.2 Eco-Community Transport Schemes 16 4.3 Park and Ride 16 4.4 Highways Schemes 16 5 ST. AUSTELL AREA TRANSPORT MODEL 17 5.1 Introduction 17 5.2 Base Year Model 17 5.3 Forecasting 18 5.4 Scheme Assessments 19 5.5 Summary of Modelling Methodology 19 6 INFRASTRUCTURE PHASING 20 6.1 Introduction 20 6.2 Standard Trip Rate Assessment 20 6.3 Summary of Strategy 28 6.4 Sustainable Trip Generation Assessment 28 September 2011 7 HIGHWAYS IMPROVEMENT SCHEMES 31 7.1 Introduction 31 7.2 Scredda Roundabout 31 7.3 Carclaze Roundabout 32 7.4 Slades Road / Polkyth Road Junction 32 7.5 Mount Charles Roundabout 32 8 SUMMARY 34 8.1 Introduction 34 8.2 Existing Conditions 34 8.3 Future Conditions 34 8.4 Development and Infrastructure Phasing Strategy 34 September 2011 ST. AUSTELL AREA HIGHWAYS STRATEGY TRANSPORT MODELLING REPORT 1 INTRODUCTION 1.1 Background 1.1.1 The St. Austell, St. Blazey and China Clay areas are diverse. St. Austell itself is a large town and is the second largest urban area in Cornwall in terms of population. The area has been affected by the restructuring of the China Clay industry which has been employing fewer people for many decades. This decline has had an impact on companies involved in the wider supply chains and associated services. In addition, over the last 20 years the area has faced significant changes, including large-scale house-building and the emergence of the Eden Project, which have had an impact on traffic and the local highways network. There is now an emphasis on regeneration of the area. 1.1.2 The town currently suffers from congestion at peak times, particularly along the A390 to the south of the town. This road is a major through-route, linking Truro to St. Austell and towns in the south-east of Cornwall; therefore congestion during commuting hours is common. This congestion is exacerbated in the extended summer period by the location of popular tourist attractions such as the Eden Project, where the majority of visitors arrive by private car. Rat-running has therefore become prevalent in the town to avoid delays on this corridor. Congestion is also experienced on the A391, which links St. Austell to the A30, particularly in the area to the north of Scredda. 1.2 St. Austell, St. Blazey and China Clay Area Regeneration Plan 1.2.1 The St. Austell, St. Blazey and China Clay Area Regeneration Plan has been produced to predominantly provide support for transformational development projects. This has particularly arisen as there is significant development pressure in the area and the Council knows it will receive substantial planning applications in 2011. The area is a Cornwall Council identified regeneration priority; there is a need for further regeneration which can build upon the work which has been undertaken in recent years in the China Clay area. The aim is to promote a new economic base rather than manage decline, leading to economic, environmental and community benefits. The Plan will inform and be informed by the development of the Core Strategy. 1.2.2 To inform the Regeneration Plan, a number of transport strategies have been produced to demonstrate how the developments within the Regeneration Plan area will be supported and delivered. This document details the Highway Strategy, and should be considered alongside the Bus Strategic Plan and the Walking and Cycling Strategies1. 1.3 St. Austell and China Clay Area Eco-Communities 1.3.1 In 2008, the Government launched plans to build a number of ‘eco-towns’ across the UK, to build communities to live and work with considerations to environmental and social values. Imerys submitted a proposal for an eco-town, and the St Austell (China Clay Community) is one of only four locations in the country supported by the Planning Policy Statement: Eco-towns. This supplementary document to Planning Policy Statement (PPS) 1 sets out the broad requirements for any proposals that come forward as an ‘eco-town’ and the principles to be considered sustainable. Imerys have now joined forces with the developer Orascom and formed the joint venture company Eco-Bos to take forward their proposals. 1 These documents and the Regeneration Plan can be found on the Cornwall Council website at http://www.cornwall.gov.uk/default.aspx?page=27043. Prepared by Parsons Brinckerhoff September 2011 Page 1 for Cornwall Council ST. AUSTELL AREA HIGHWAYS STRATEGY TRANSPORT MODELLING REPORT 1.4 Connecting Cornwall: 2030 1.4.1 Cornwall’s third Local Transport Plan, Connecting Cornwall: 2030 was published in April 2011. The document is supported by an Implementation Plan, which covers the period from 2011 – 2015. 1.4.2 The Connecting Cornwall document sets the transportation strategy over the next 20 years, and considers improvements to the transport network and services and how these may be delivered. The strategy aligns with the Sustainable Community Strategy and Local Development Framework, to produce an integrated strategy for sustainable travel across the county, as well as planning for future sustainable development. This overarching strategy will guide planning of future development within St. Austell to ensure the sustainability of developments is maximised. 1.5 St. Austell Area Transport Model 1.5.1 A transport model of the St. Austell, St. Blazey and China Clay areas has been developed by Parsons Brinckerhoff on behalf of Cornwall Council, in order to assess the impact of future development and to identify required improvement schemes and measures to mitigate this impact. The model has been used to assess the impact of the potential development on the local and strategic highway networks, St. Austell town centre and key junctions within the local area. The transport model is described in more detail in Section 5. 1.6 Previous Reports 1.6.1 A number of previous reports have been produced as part of this project. These are: x Baseline Conditions Report (Report No. WHV285300/1/3) x Traffic Survey Report (Report No. WHV285300/2/1) x Local Model Validation Report (Report No. WHV285300/3/1) x Forecasting Report (Report No. WHV285300/4/1) 1.7 Purpose of Report 1.7.1 This report summarises the existing conditions on the transport network in the St. Austell area, details the outputs from the assessments of the impact of future development and identifies possible phasing of improvement schemes. 1.7.2 The report is prompted by proposals for the eco-communities which have tacit long term development scenarios. Other development proposals within the area are considered as possible scenarios, giving some definition to the locations at which future traffic loadings are likely to be added to the network. None of these modelled scenarios imply any predisposition from Cornwall Council to allow these developments to come forward. Prepared by Parsons Brinckerhoff September 2011 Page 2 for Cornwall Council ST. AUSTELL AREA HIGHWAYS STRATEGY TRANSPORT MODELLING REPORT 1.7.3 The report is set out as follows: x Section 2: Summary of Existing Conditions; this section outlines existing traffic flows in St. Austell throughout the year and identifies areas of congestion. x Section 3: Future Development; this section details the development included in the transport modelling scenarios; x Section 4: Transport Schemes; this section summarises the transport schemes included within the modelling scenarios; x Section 5: St. Austell Transport Model; this section summarises the methodology used in the transport modelling assessments; x Section 6: Infrastructure Phasing; this section details outputs from the modelling assessments of each of the future year scenarios; x Section 7: Highways Improvements; this section identifies the junction improvements schemes required to provide mitigation at junctions where congestion is predicted to occur in future years. x Section 8: Summary; this section provides a summary of the report and the identified transport strategy. x Appendix 1; this provides a list of measures included within the eco- communities travel plan, aimed to promote and maximise sustainable travel.