Crawley Transport Study Transport Study of Strategic Development Options and Sustainable Transport Measures Draft Crawley Local Plan 2021 - 2037 On behalf of Crawley Borough Council Project Ref: 48559/001 | Rev: AA | Date: December 2020 Registered Office: Buckingham Court Kingsmead Business Park, London Road, High Wycombe, Buckinghamshire, HP11 1JU Office Address: Caversham Bridge House, Waterman Place, Reading, Berkshire RG1 8DN T: +44 (0)118 950 0761 E: [email protected] Transport Study of Strategic Development Options and Sustainable Transport Measures Crawley Transport Study Document Control Sheet Project Name: Crawley Transport Study Project Ref: 48559 Report Title: Transport Study of Strategic Development Options and Sustainable Transport Measures Doc Ref: 48559/CTS/TA Date: December 2020 Name Position Signature Date Prepared by: Norbert Moyo Principal 15/12/2020 Reviewed by: Paul Gebbett Senior Associate 18/12/2020 Approved by: Sarah Matthews Director 21/12/2020 For and on behalf of Stantec UK Limited Revision Date Description Prepared Reviewed Approved A 06/04/21 Address CBC&WSCC comments NM PG SM Address additional CBC&WSCC B 12/05/2021 NM PG SM comments This report has been prepared by Stantec UK Limited (‘Stantec’) on behalf of its client to whom this report is addressed (‘Client’) in connection with the project described in this report and takes into account the Client's particular instructions and requirements. This report was prepared in accordance with the professional services appointment under which Stantec was appointed by its Client. This report is not intended for and should not be relied on by any third party (i.e., parties other than the Client). Stantec accepts no duty or responsibility (including in negligence) to any party other than the Client and disclaims all liability of any nature whatsoever to any such party in respect of this report. G:\Planning - Forward Planning\Local Plan Review ii 2018\Evidence Base\Transport\Final Report for Publication (May 2021)\Crawley Transport Study Transport Study of Strategic Development Options and Sustainable Transport Measures Crawley Transport Study Contents 1 Introduction ............................................................................................................................. 10 1.1 Introduction .................................................................................................................. 10 1.2 Local Context ............................................................................................................... 12 1.3 Approach to Study and Purpose of this Report ........................................................... 13 1.4 Report Structure .......................................................................................................... 14 2 Crawley Transport Model ...................................................................................................... 15 2.1 Introduction .................................................................................................................. 15 2.2 Overview of the Crawley Transport Model .................................................................. 15 3 Transport Forecasting Modelling Approach ....................................................................... 19 3.1 Introduction .................................................................................................................. 19 3.2 Traffic Forecasting Modelling Methodology ................................................................ 19 3.3 Reference Case Definition for Crawley ....................................................................... 20 3.4 Draft Crawley Local Plan Scenario Definition ............................................................. 21 3.5 Reference Case Network Assumptions/Changes ....................................................... 24 3.6 Highways England Schemes Dialogue ....................................................................... 26 4 Draft Crawley Local Plan Development Assumptions ........................................................ 27 4.1 Introduction .................................................................................................................. 27 4.2 Overview of Modelled Draft Crawley Local Plan Scenarios ........................................ 27 4.3 Location of Key Development Sites ............................................................................ 31 4.4 Adopted and Draft Local Plan Modelling Development Details .................................. 32 5 Draft Crawley Local Plan Impacts – Without Mitigation ..................................................... 49 5.1 Introduction .................................................................................................................. 49 5.2 Traffic Flow Changes................................................................................................... 49 5.3 Identification of Overcapacity Junctions ...................................................................... 50 6 Sustainable Mitigation Considerations ................................................................................ 58 6.1 Introduction .................................................................................................................. 58 6.2 Accessible Transportation Links .................................................................................. 59 6.3 Sustainable Measures Considerations and Assessment ............................................ 60 6.4 Assessment of Sustainable Mitigation Measures ........................................................ 61 6.5 General Assessment Approach ................................................................................... 61 6.6 Distance based car trip reductions .............................................................................. 62 6.7 Propensity to Cycle Tool Car Trip Reductions ............................................................ 62 6.8 Kilnwood Vale and West of Ifield Developments Specific Car Trip Reductions .......... 63 6.9 Model Assignments ..................................................................................................... 63 6.10 Further Commentary of Sustainable Mitigation Measures .......................................... 63 7 Draft Crawley Local Plan Impacts – With Sustainable Travel Mitigation .......................... 72 7.1 Introduction .................................................................................................................. 72 7.1 Flow Changes .............................................................................................................. 72 7.2 Scenario 1 Overcapacity Junctions ............................................................................. 72 G:\Planning - Forward Planning\Local Plan Review iii 2018\Evidence Base\Transport\Final Report for Publication (May 2021)\Crawley Transport Study Transport Study of Strategic Development Options and Sustainable Transport Measures Crawley Transport Study 7.3 Scenario 2 Overcapacity Junctions ............................................................................. 73 7.4 Scenario 3 Overcapacity Junctions ............................................................................. 75 7.5 Consideration of Further Mitigation ............................................................................. 76 7.6 Crawley Avenue/Ifield Avenue Mitigation .................................................................... 81 7.7 Further discussion of Gatwick Green Impacts ............................................................ 82 7.8 Summary ..................................................................................................................... 83 8 Impacts on the Strategic Road Network (SRN) ................................................................... 85 8.1 Introduction .................................................................................................................. 85 8.2 Merge and Diverge Capacity Assessment .................................................................. 85 8.3 M23 Junction 9 ............................................................................................................ 85 8.4 M23 Junction 10 .......................................................................................................... 89 8.5 M23 Junction 10A ........................................................................................................ 92 8.6 M23 Junction 11 .......................................................................................................... 93 9 Crawley Western Link Road Sensitivity Test ...................................................................... 99 9.1 Introduction .................................................................................................................. 99 9.2 Brief description of CWLR and Assumptions .............................................................. 99 9.3 Flow Changes .............................................................................................................. 99 9.4 Analysis of Volume to Capacity Ratios (VC%) .......................................................... 100 9.5 Summary and Conclusions ....................................................................................... 101 10 Safety Considerations.......................................................................................................... 103 10.1 Introduction ...............................................................................................................