A120 Braintree to A12 Essex County Council Options Assessment Report B3553T41-JAC-GEN-00-RP-C-002 | P00 5 April 2016 Document Ti tle Client Name A120 Braintree to A12 Options Assessment Report Project Name Project no: B3553T41 Document title: A120 Braintree to A12 – Options Assessment Report Document No.: B3553T41-JAC-GEN-00-RP-C-002 Revision: P00 Date: 5 April 2016 Client name: Essex County Council Client no: - Project manager: Rob Davenport Author: Cameron Harvey File name: A120 Braintree to A12 OAR y16m04d05 Jacobs U.K. Limited Jacobs House Shrewsbury Business Park Shrewsbury Shropshire SY2 6LG United Kingdom T +44 (0)1743 284 800 F +44 (0)1743 245 558 www.jacobs.com © Copyright 2016 Jacobs U.K. Limited. The concepts and information contained in this document are the property of Jacobs. Use or copying of this document in whole or in part without the written permission of Jacobs constitutes an infringement of copyright. Limitation: This report has been prepared on behalf of, and for the exclusive use of Jacobs’ Client, and is subject to, and issued in accordance with, the provisions of the contract between Jacobs and the Client. Jacobs accepts no liability or responsibility whatsoever for, or in respect of, any use of, or reliance upon, this report by any third party. Document history and status Revision Date Description By Review Approved P00 05-04-2016 Options Assessment Report C Harvey M Stubbs R. D. Document No. i A120 Braintree to A12 Options Assessment Report Contents Executive Summary ...................................................................................................................................... 1 1. Introduction ....................................................................................................................................... 1 1.1 A120 Braintree Town to Marks Tey .................................................................................................... 1 1.2 The Appraisal ..................................................................................................................................... 2 1.3 The Transport Appraisal Process ....................................................................................................... 2 1.4 Purpose of this Document .................................................................................................................. 3 1.5 Report Structure ................................................................................................................................. 4 1.6 Limitation Statement ........................................................................................................................... 4 2. Definition of Problems & Objectives .............................................................................................. 5 2.1 Introduction ......................................................................................................................................... 5 2.2 Summary of the Outcomes from the Problems and Objectives Technical Note ................................ 5 2.2.1 Review of Previous Work and Studies ............................................................................................... 5 2.2.2 Identification of Geographic Area of Impact ....................................................................................... 6 2.2.3 Understanding of the Current and Future Situation ........................................................................... 7 2.2.4 Identification of Intervention Specific Objectives .............................................................................. 10 3. Options Generation ........................................................................................................................ 12 3.1 Options Generation Workshop ......................................................................................................... 12 3.2 Addition of Historic Options .............................................................................................................. 12 3.3 Aggregate Options ............................................................................................................................ 13 3.4 Review of Aggregate Options Groups .............................................................................................. 13 4. Options Sifting ................................................................................................................................ 15 4.1 Introduction ....................................................................................................................................... 15 4.2 Pre-EAST Initial Sifting ..................................................................................................................... 15 4.3 EAST-based Detailed Sifting ............................................................................................................ 22 4.3.1 Qualitative Indicators ........................................................................................................................ 23 4.3.2 Strategic Case .................................................................................................................................. 25 4.3.3 Economic Case ................................................................................................................................ 26 4.3.4 Management Case ........................................................................................................................... 29 4.3.5 Financial Case .................................................................................................................................. 30 4.3.6 Commercial Case ............................................................................................................................. 32 4.3.7 Design Safety ................................................................................................................................... 32 4.3.8 Detailed Sifting Results .................................................................................................................... 32 4.4 Options Sifting Conclusions ............................................................................................................. 39 5. Development & Appraisal of Potential Options .......................................................................... 41 5.1 Methodology ..................................................................................................................................... 41 5.1.1 Development of Basic Transport & Economic Model ....................................................................... 41 5.1.2 Further Design & Cost Estimates ..................................................................................................... 42 5.1.3 Environment Assessment ................................................................................................................. 43 5.1.4 Road Safety Assessment ................................................................................................................. 44 5.2 Description of Potential Options ....................................................................................................... 45 Document No. ii A120 Braintree to A12 Options Assessment Report 5.3 Evidence ........................................................................................................................................... 45 5.3.1 Forecast Traffic Volumes.................................................................................................................. 46 5.3.2 Maps of the Route Alignments with Key Statistics ........................................................................... 49 5.3.3 Analysis of Capacity of the Options .................................................................................................. 60 5.3.4 Traffic Data Inputs into Economic Model .......................................................................................... 62 5.3.5 Road Safety Performance ................................................................................................................ 63 5.4 Options Assessment ......................................................................................................................... 67 5.4.1 Strategic Fit ...................................................................................................................................... 67 5.4.2 Economic Value for Money Case ..................................................................................................... 69 5.4.3 Financial Case .................................................................................................................................. 83 5.4.4 Delivery / Managerial Case .............................................................................................................. 83 5.4.5 Commercial Case ............................................................................................................................. 84 5.4.6 Identification of Sources of Uncertainty and Risk ............................................................................. 85 6. Summary of Results ....................................................................................................................... 86 7. Conclusions – Identification of Better Performing Options ....................................................... 89 Appendix A. Summary of Engineering Constraints