Ell A483 Llandeilo Transport Study Welsh Government WelTAG Stage One: Strategic Outline Case Report Document No. |B2331900-D4-5-001 30 August 2018 WelTAG Stag e 1: Strat egic O utline Case R epo rt Welsh Gov ern men t 1 A483 Llandeilo Transport Study WelTAG Stage One: Strategic Outline Case Report A483 Llandeilo Transport Study Project No: B2331900 Document Title: A483 Llandeilo Transport Study WelTAG Stage One: Strategic Outline Case Report Document No.: B2331900-D4-5-001 Revision: 1.0 Date: August 30, 2018 Client Name: Welsh Government Client No: Transport Consultancy Framework Task 1/14 Project Manager: Julie Hunt Author: Emily Wignall / Voirrey Costain Jacobs U.K. Limited 5 First Street Manchester M15 4GU United Kingdom T +44 (0)161 235 6000 www.jacobs.com © Copyright 2018 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 document 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 document by any third party. Document history and status Revision Date Description By Review Approved 0.1 June 2018 Draft for Comment by Welsh Government EW/VC JA/VC JH 0.2 July 2018 Amended following comments EW/VC JA/VC JH 1.0 Aug 2018 Final EW/VC JA/VC JH Document Number: B2331900-D4-5-001 i A483 Llandeilo Transport Study WelTAG Stage One: Strategic Outline Case Report Contents 1. Introduction & Scope ........................................................................................................................... 1 1.1 Background ........................................................................................................................................... 1 1.2 Scope of the Study ................................................................................................................................ 1 1.3 Study Area ............................................................................................................................................. 2 1.4 Exclusions from the Scope ..................................................................................................................... 3 1.5 Previous Transport Studies at Llandeilo ................................................................................................. 3 1.6 Scope of the WelTAG Stage One Report – Strategic Outline Case ......................................................... 4 1.7 Report Structure .................................................................................................................................... 6 2. Strategic Case ...................................................................................................................................... 7 2.1 Introduction ............................................................................................................................................ 7 2.2 Legislative and Policy Context ............................................................................................................... 7 2.2.1 Key National Legislation......................................................................................................................... 7 2.2.2 Key National Policy and Guidance ......................................................................................................... 8 2.2.3 Regional Context ................................................................................................................................. 11 2.2.4 Local Context....................................................................................................................................... 11 2.3 Existing Situation ................................................................................................................................. 12 2.3.1 Highway Network ................................................................................................................................. 12 2.3.2 Public Transport................................................................................................................................... 13 2.3.3 Traffic Flows ........................................................................................................................................ 15 2.3.4 Accident Data Analysis ........................................................................................................................ 18 2.3.5 Air Quality ............................................................................................................................................ 20 2.4 Identification of Issues of Concern ....................................................................................................... 20 2.4.1 Introduction .......................................................................................................................................... 20 2.4.2 Site Visits............................................................................................................................................. 21 2.4.3 Consultation – Workshop 1 .................................................................................................................. 21 2.4.4 Identification of Issues of Concern ....................................................................................................... 21 2.5 Identification of Scheme Objectives...................................................................................................... 25 2.6 Long List of Options ............................................................................................................................. 29 2.6.1 Introduction .......................................................................................................................................... 29 2.6.2 Consultation – Workshop 2 .................................................................................................................. 29 2.6.3 Consultation – Public Forums .............................................................................................................. 29 2.6.4 Road Links associated with some Options ........................................................................................... 30 2.6.5 Consideration of Non-Transport Sector Solutions ................................................................................. 30 2.6.6 Assumptions used in the Appraisal....................................................................................................... 31 2.6.7 Do-Minimum Option ............................................................................................................................. 31 2.6.8 Town Centre Options ........................................................................................................................... 31 2.6.9 Non- Bypass Options ........................................................................................................................... 32 Document Number: B2331900-D4-5-001 ii A483 Llandeilo Transport Study WelTAG Stage One: Strategic Outline Case Report 2.6.10 Eastern Bypass Options....................................................................................................................... 32 2.6.11 Road Links .......................................................................................................................................... 33 2.6.12 Western Bypass Options ...................................................................................................................... 33 2.6.13 Tunnel ................................................................................................................................................. 33 3. Transport Case .................................................................................................................................. 34 3.1 Methodology ........................................................................................................................................ 34 3.2 Appraisal Criteria ................................................................................................................................. 34 3.3 Option Appraisal .................................................................................................................................. 35 3.3.1 Do-Minimum Option ............................................................................................................................. 35 3.3.2 Town Centre Options ........................................................................................................................... 38 3.3.3 Non- Bypass Options ........................................................................................................................... 46 3.3.4 Eastern Bypass Options....................................................................................................................... 60 3.3.5 Road Links .......................................................................................................................................... 94 3.3.6 Western Bypass Options .....................................................................................................................