Information Classification: CONTROLLED A38 Bodmin to Saltash: Road Safety Feasibility Study Technical Report Cornwall Council Project number: 60571547 - 0112 12 September 2019 Natalie Warr Cornwall Council Pydar House Pydar Street Truro TR1 1XU A38 Bodmin to Saltash Road Safety Feasibility Study Cornwall Council Project number: 60571547 - 0112 Quality information Prepared by Checked by Verified by Approved by Iain King Sam Barnes, Alan Rodgers, Regional Alan Rodgers, Regional Senor Engineer Associate Director Director Director Revision History Revision Revision date Details Authorized Name Position 0 20/03/19 First Issue - Draft AR Alan Rodgers Regional Director 1 11/04/2019 First Revision - AR Alan Rodgers Regional Director Draft 2 19/06/2019 HE comments – AR Alan Rodgers Regional Director Final Draft 3 16/08/2019 Stakeholder AR Alan Rodgers Regional Director comments – Final Draft 4 12/09/2019 Final Issue AR Alan Rodgers Regional Director Distribution List # Hard Copies PDF Required Association / Company Name 0 Yes Cornwall Council Prepared for: Cornwall Council AECOM A38 Bodmin to Saltash Road Safety Feasibility Study Cornwall Council Project number: 60571547 - 0112 Prepared for: Natalie Warr Cornwall Council Pydar House Pydar Street Truro TR1 1XU Prepared by: Iain King Senor Engineer T: 01752 676794 E: [email protected] AECOM Limited Belvedere House Woodwater Park, Pynes Hill Exeter EX2 5WS United Kingdom T: +44 1392 663200 aecom.com Reviewed by: Highways England Brunel House 930 Hempton Court Aztec West Almondsbury BS32 4SR © 2019 AECOM Limited. All Rights Reserved. This document has been prepared by AECOM Limited (“AECOM”) for sole use of our client (the “Client”) in accordance with generally accepted consultancy principles, the budget for fees and the terms of reference agreed between AECOM and the Client. Any information provided by third parties and referred to herein has not been checked or verified by AECOM, unless otherwise expressly stated in the document. No third party may rely upon this document without the prior and express written agreement of AECOM. Prepared for: Cornwall Council AECOM A38 Bodmin to Saltash Road Safety Feasibility Study Cornwall Council Project number: 60571547 - 0112 Table of Contents 1. Executive Summary 7 2. Introduction 10 2.1 Introduction ........................................................................................................................ 10 2.2 Objectives .......................................................................................................................... 10 2.3 Study Corridor.................................................................................................................... 11 2.4 Previous Studies ................................................................................................................ 11 2.5 This Study .......................................................................................................................... 11 3. Collision Review 12 3.1 Collision Definition ............................................................................................................. 12 3.2 Collision Data Disclaimer ................................................................................................... 12 3.3 Collision Overview ............................................................................................................. 13 3.4 Analysis by Collisions & Injury Severity ............................................................................. 15 3.5 Analysis by Weather Conditions ........................................................................................ 15 3.6 Analysis by Road Surface Conditions ............................................................................... 16 3.7 Analysis by Road Lighting Conditions ............................................................................... 16 3.8 Analysis by Day of the Week ............................................................................................. 16 3.9 Analysis by Time of the Day .............................................................................................. 17 3.10 Analysis by Month ............................................................................................................. 18 3.11 Analysis by Journey Type .................................................................................................. 19 3.12 Analysis of Contributory Causation Factor ........................................................................ 20 3.13 Analysis of Casualty Data by Mode and Injury Severity .................................................... 21 3.14 Analysis by Mode of Travel ................................................................................................ 23 3.15 Analysis by Vehicle Manoeuvre ......................................................................................... 24 3.16 Analysis of Vehicles Leaving the Carriageway .................................................................. 25 3.17 Analysis of Collisions by Junction Detail ........................................................................... 26 3.18 Analysis of Collisions by Speed Limit ................................................................................ 27 3.19 Summary of Main Collisions Trends & Problems .............................................................. 27 4. Review of SAFE38 Proposals & Issues 29 4.1 Average Speed Cameras .................................................................................................. 29 4.2 2+1 Sections Shortening ................................................................................................... 32 4.3 Median Widening / Surface Treatment .............................................................................. 39 4.4 Stopping Distance Signs ................................................................................................... 40 4.5 Overhanging Vegetation Review ....................................................................................... 42 4.6 Speed Limit Review ........................................................................................................... 46 4.7 Traffic Signal Controlled Pedestrian Crossing at Tideford ................................................. 51 4.8 Limiting Right Turns ........................................................................................................... 54 4.9 Farm Traffic Limitation ....................................................................................................... 59 4.10 Revised Layout in Villages ................................................................................................ 61 4.11 Drainage ............................................................................................................................ 63 4.12 Other Proposals ................................................................................................................. 65 4.13 Other Options Considered ................................................................................................. 66 5. Other Route Issues / Measures Identified 69 5.1 Cluster sites analysis ......................................................................................................... 69 6. Proposed Works Package 90 6.1 Overview ............................................................................................................................ 90 6.2 Short term (2020) .............................................................................................................. 90 6.3 Medium term (2020 – 2025) .............................................................................................. 92 6.4 Long term (2025 and beyond) ........................................................................................... 95 7. Monitoring 96 Appendices 97 Prepared for: Cornwall Council AECOM A38 Bodmin to Saltash Road Safety Feasibility Study Cornwall Council Project number: 60571547 - 0112 Appendix A – Collision Data ......................................................................................................... 97 Appendix B – Collision Location Plot ........................................................................................... 98 Appendix C – Median Widening Plan .......................................................................................... 99 Appendix D – Tideford Pedestrian Crossing Proposals ............................................................ 100 Appendix E – Additional Cluster Site Plan ................................................................................. 101 Appendix F – Proposed package of measures in Tideford ........................................................ 102 Figures Figure 1: Site location and route layout plan......................................................................................... 10 Figure 2: Infographic summarising A38 headline collision statistics ..................................................... 14 Figure 3: Analysis by Time of the Day ................................................................................................... 18 Figure 4: A38 Collisions by month of the year ...................................................................................... 19 Figure 5: Speed enforcement measures proposed along the route ..................................................... 32 Figure 6: Layout of a typical climbing lane (DMRB TD 9/93) ...............................................................