A27 Chichester Bypass Technical Appraisal Report 343538-90-060-RE-002-P02 September 2015 Project Support Framework (Consultancy) 2011 – 2016 A27 Chichester Bypass Technical Appraisal Report A27 Chichester Bypass Technical Appraisal Report 343538-90-060-RE-002-P02 Revision Record Revision Date Originator Checker Approver Description No P01 29 May 2015 First Issue P02 2 Sept 2015 Revised following SGAR1 comments This document has been prepared on behalf of Highways England by Mott MacDonald Grontmij JV for Highways England's Project Support Framework (PSF) (Consultancy) 2011-2016. It is issued for the party which commissioned it and for specific purposes connected with the above-captioned project only. It should not be relied upon by any other party or used for any other purpose. Mott MacDonald Grontmij JV accepts no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties. This document contains confidential information and proprietary intellectual property. It should not be shown to other parties without consent from Mott MacDonald Grontmij JV and from the party which commissioned it. Prepared for: Prepared by: Highways England Mott MacDonald Grontmij JV 1 Walnut Tree Close Stoneham Place Guildford Stoneham Lane Surrey Southampton GU1 4LZ SO50 9NW Project Support Framework (Consultancy) 2011 – 2016 A27 Chichester Bypass Technical Appraisal Report Contents Page Executive Summary ........................................................................................................... 1 1 Introduction .............................................................................................................. 5 2 Planning Brief ........................................................................................................... 6 2.1 Project Objectives ................................................................................................... 6 2.2 Understanding the Current Situation ....................................................................... 7 2.2.1 Operational and Capacity Situation ........................................................................ 7 2.2.2 Safety Situation ..................................................................................................... 10 2.2.3 Social and Environmental Situation ...................................................................... 11 2.3 Understanding the Future Situation ...................................................................... 11 2.4 Need for Intervention ............................................................................................ 12 3 Existing Conditions ............................................................................................... 14 3.1 Description of the Locality ..................................................................................... 14 3.1.1 The City of Chichester and District ....................................................................... 14 3.1.2 A27 Chichester Bypass ........................................................................................ 15 3.2 Traffic .................................................................................................................... 16 3.3 Accidents and Journey Time Reliability ................................................................ 17 3.3.1 Accident Analysis Methodology ............................................................................ 17 3.3.2 Accident Analysis – A27 Route Overview ............................................................. 17 3.3.3 Journey Time Reliability ........................................................................................ 19 3.4 Topography, Land Use, Property and Industry ..................................................... 19 3.4.1 Topography .......................................................................................................... 19 3.4.2 Land Use, Property and Industry .......................................................................... 19 3.5 Climate ................................................................................................................. 20 3.6 Drainage ............................................................................................................... 22 3.6.1 Existing Situation .................................................................................................. 22 3.6.2 Proposed Drainage ............................................................................................... 23 3.7 Geology ................................................................................................................ 24 3.7.1 Geology along the existing Chichester Bypass ..................................................... 25 3.7.2 Surrounding Geology ............................................................................................ 25 3.8 Mining ................................................................................................................... 26 - i - Project Support Framework (Consultancy) 2011 – 2016 A27 Chichester Bypass Technical Appraisal Report 3.9 Accessibility .......................................................................................................... 26 3.10 Integration ............................................................................................................. 26 3.11 Environment.......................................................................................................... 27 3.12 Public Utilities ....................................................................................................... 27 3.12.1 General .............................................................................................................. 27 3.12.2 Fishbourne Junction .......................................................................................... 28 3.12.3 Fishbourne to Stockbridge Link ......................................................................... 28 3.12.4 Stockbridge Link Road (SLR) ............................................................................ 29 3.12.5 Stockbridge Junction ......................................................................................... 29 3.12.6 Whyke Junction ................................................................................................. 29 3.12.7 Bognor Road Junction ....................................................................................... 30 3.12.8 Oving Junction ................................................................................................... 30 3.12.9 Portfield Junction ............................................................................................... 30 3.12.10 Summary of C3 Estimates ................................................................................. 30 4 Planning Factors .................................................................................................... 32 4.1 Local Planning Policy ............................................................................................ 32 4.2 West Sussex Transport Plan ................................................................................ 32 4.3 Chichester District Council Local Plan .................................................................. 33 4.4 Options Constraints .............................................................................................. 34 5 Description of Route Options ............................................................................... 36 5.1 Introduction ........................................................................................................... 36 5.2 Online Option Development .................................................................................. 36 5.2.1 Online Options General Notes .............................................................................. 36 5.2.2 Fishbourne Junction ............................................................................................. 37 5.2.3 Stockbridge Junction ............................................................................................ 40 5.2.4 Whyke Junction .................................................................................................... 43 5.2.5 Bognor Road Junction .......................................................................................... 46 5.2.6 Oving Junction ...................................................................................................... 48 5.2.7 Portfield Junction .................................................................................................. 49 5.2.8 Stockbridge Link Road .......................................................................................... 52 5.2.9 Online Option Descriptions ................................................................................... 52 5.3 Offline Option Development .................................................................................. 54 5.3.1 Design Strategy .................................................................................................... 54 - ii - Project Support Framework (Consultancy) 2011 – 2016 A27 Chichester Bypass Technical Appraisal Report 5.3.2 Offline Route Selection and Refinement ............................................................... 54 5.3.3 Offline Route Descriptions ...................................................................................