NORTH NORTHAMPTONSHIRE TRANSPORT MODEL Developer Impacts – Wellingborough Town Centre Area Action Plan – Preferred Option
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NORTH NORTHAMPTONSHIRE TRANSPORT MODEL Developer Impacts – Wellingborough Town Centre Area Action Plan – Preferred Option JOB NUMBER: 5051674.1595.925 DOCUMENT REF: Wellingborough Area Action Plan Development Impacts – Preferred Option 01 Developer Impact Report DD TD CS CS 03/01/08 Originated Checked Reviewed Authorised Date Revision Purpose Description NORTH NORTHAMPTONSHIRE TRANSPORT MODEL Developer Impacts – Wellingborough Town Centre Area Action Plan Contents Section Page 1. Introduction 1-1 2. Do-Minimum Highway Network and Matrix Changes 2-3 Trip Matrix Changes 2-8 3. Assessment of the Wellingborough Town Centre AAP 3-9 Preferred Land Use Option 3-9 Highway Options 3-9 Trip Rates and Flow 3-10 Distribution of Flow 3-10 Global Statistics 3-11 Junction Turning Movement Demand Flows / Stress Levels / Average Queues 3-11 Link Demand Flows 3-11 Link Stress Levels 3-12 Journey Times 3-12 Town Centre Through-Traffic 3-12 Trip Suppression 3-12 4. Summary 4-13 Appendices Appendix A – Land Use Tables Appendix B – Highway Options Appendix C – Trip Rates and Generation Appendix D –Global Statistics Appendix E – Junction Turning Movements – Demand Flows, Stress Levels and Average Queues Appendix F – Links – Peak Hour Traffic Demand Flows Appendix G – Links – Peak Hour Stress Levels Appendix H – Journey Times Appendix I – Town Centre Through-Traffic Appendix J – Trip Suppression NNTM Wellingborough AAP - Preferred Option.doc NORTH NORTHAMPTONSHIRE TRANSPORT MODEL Developer Impacts – Wellingborough Town Centre Area Action Plan 1. Introduction 1.1 Northamptonshire is part of the Milton Keynes and South Midlands (MKSM) ‘Growth Area’ study. The MKSM study report highlights potential for the development within the wider sub-region including Corby, Kettering and Wellingborough. 1.2 Atkins has been commissioned by Northamptonshire County Council (NCC) and the Joint Planning Unit (JPU) to develop a transport model of North Northamptonshire and the surrounding area. This transport model builds on the Corby Model that was developed by Atkins for NCC in 2004/2005. The Corby model has been subsequently used for the assessment of developments within the area and to inform both developers and NCC of the impacts on the highway networks. 1.3 The purpose of the North Northamptonshire model is to enable the impacts of proposed new developments within the study area to be identified and assess potential transport improvements. As a result of this, the model is a key tool in enabling the development of a transport strategy that is capable of meeting the future demands on the transport infrastructure. 1.4 Traditionally, developments have been assessed on an individual basis, considering the local network impacts. This impact is considered minimal once the increase in trips compared to the Do-Minimum traffic flow at a junction is below 5% for congested junctions. 1.5 The council have recognised, however, that where several new developments may increase traffic levels at a junction by less than 5% the cumulative impacts may be significant. The use of a Transport model will aid the identification of the impacts of all the developments cumulatively as opposed to the traditional individual local impacts. 1.6 The North Northamptonshire model has been designed to assess the impacts of developments in both the AM and PM peak hours and at four forecast traffic years, namely 2011, 2016, 2021 and 2031. This has enabled the potential phasing of developments to be considered for each analysis year. 1.7 Following an extensive data review and consultations with relevant developers, and their consultants, the traffic model for these forecast years has been developed and the strategic impacts of the developments as a whole as well as the individual development contributions may now be assessed. The underlying assumptions within this model have been applied to all developments, hence providing an equitable assessment of all developments within North Northamptonshire. 1.8 This Developer Impact Report provides the appropriate assessment for the Wellingborough Town Centre Area Action Plan (AAP) preferred development option and considers the following: ♦ Highway network changes; ♦ Trip matrix changes; and ♦ Assessment of the development scenarios. 1-1 NNTM Wellingborough AAP - Preferred Option.doc NORTH NORTHAMPTONSHIRE TRANSPORT MODEL Developer Impacts – Wellingborough Town Centre Area Action Plan 1.9 This report aims to provide the developer with an understanding of the wider impacts of the introduction of both their individual development and the total of the proposed developments within the study area. 1.10 A number of scenarios have been developed for this assessment, consisting of a preferred development option, with and without modal shift and two highway layouts. 1.11 This report provides an objective assessment of the impacts of this development. As such, no specific interpretation or conclusions have been drawn for the purpose of this report. 1-2 NNTM Wellingborough AAP - Preferred Option.doc NORTH NORTHAMPTONSHIRE TRANSPORT MODEL Developer Impacts – Wellingborough Town Centre Area Action Plan 2. Do-Minimum Highway Network and Matrix Changes 2.1 As noted in Section 1, this model has been developed to consider the impacts of the substantial development growth proposed in the North Northamptonshire area. It is recognised that this expected growth will result in a significant increase in trips on the highway network. 2.2 The proposed highway network changes in North Northamptonshire are dependant on the proposed developments being granted. 2.3 Following discussions with NCC and the JPU, a list of all highway schemes to be included in the Do-Minimum scenario was compiled. This includes: ♦ Likely proposed schemes; ♦ Committed schemes; and ♦ Schemes associated with developments. 2.4 These highway schemes are listed in Table 2.1 overleaf, which shows the year the schemes have been implemented within the model. To accompany this table the schemes included in the model are illustrated in Figure 2.1 and Figure 2.2. 2-3 NNTM Wellingborough AAP - Preferred Option.doc NORTH NORTHAMPTONSHIRE TRANSPORT MODEL Developer Impacts – Wellingborough Town Centre Area Action Plan Table 2.1 – Highway Schemes Included within the North Northamptonshire Model Location Scheme Year of Modelled Years Implementation Wellingborough A45/Turnells Mill Lane – All approaches signalised. 2026 2031 Additional lanes on some approaches. Size of roundabout increased. Cut through link for the movement between the connector road and Turnells Mill Lane (east) Wellingborough A509 London Road / Turnells Mill Lane. The Embankment – 2026 2031 All approaches signalised. Additional lanes on some approaches. Roundabout diameter increased. Cut through links: between London Road (N) and Turnells Mill Lane & London Road (S) & The Embankment Wellingborough A509 Kettering Road / Niort Way / Northen Way / 2016 2016 Harrowden Road/ Wellingborough Road - Left turn slip lane from Niort Way to Kettering Road. Widening of Kettering Road approach. Closure of Wellingborough Road entry to the roundabout with the new link provided 400m to the north. Wellingborough Northen Way / Stewarts Road – Minor widening on existing 2016 2016 approaches. Additional arm for access into the site. Wellingborough A45 / Ditchford Road – Northern Roundabout – Changes to 2026 2031 signals. Eastbound on-slip to the A45. Wellingborough A45 / Ditchford Road – Southern Roundabout – Changes to 2026 2031 signals. Eastbound off-slip from the A45. Wellingborough Midland Road / Senwick Road / Elsden Road - Additional 2016 2016 lanes on some approaches. Left turn slip from Elsden Road to Midland Road. Wellingborough Link between Midland Road and Weast inc. bridges 2016 2016 Wellingborough A510 Finedon Road / Wellingborough East Access Route 2016 2016 – New junction – provision of two roundabouts. Three lane approaches on all Finedon Road arms. Wellingborough Sanders Road / Wellingborough East Access Route – New 2016 2016 4-arm signalised junction. Wellingborough The Embankment / Wellingborough East Access Route – 2016 2016 New 3-arm roundabout. Wellingborough Internal Road through Flood Plain 2011 Wellingborough Northen Way / Stewarts Road – Access road through site. 2016 Wellingborough Wilby Roundabout – improvements – increased capacity 2011 Wellingborough Midland Road Bridge – Linking Wellingborough with 2011 developments Wellingborough IWIMP – A509 Isham to Wellingborough Improvement Works 2011 Desborough B669 Stoke Road – New priority access junction 2011 Desborough Harborough Road – New access roundabout 2011 Desborough B669 Stoke Road – Upgraded (width increased – still single) 2011 Desborough Stoke Road / Harborough Road – dedicated right-turn from 2011 Stoke Road Desborough Pipewell Road – New priority access junction 2011 Rothwell A6 / Site Access – New three arm roundabout 2011 Rothwell B576 Access – New 4-arm roundabout into both sections of 2011 site Kettering A14 J7 – Signal Control at all entries. Widening A14 2011 eastbound off-slip and A43 entries to roundabout, and circulatory in this vicinity. Widen to 2 lanes on A14 westbound on-slip. Widen to 2 lanes on A14 westbound off-slip. Lengthen A14 eastbound off-slip. Circulatory increased to: 4 lanes between A43 entry and A4300 exit, 3 lanes over both A14 bridges and 3 lanes south of A14 Kettering A6003 / A6014 – Increased capacity and signalisation 2011 Kettering A6003 / Barford Bridge Junction (tie in of cir) – 50mph both 2011 directions until CLR Kettering Access from A6003 – New roundabout