A96 Dualling Inverness to Nairn (including Nairn Bypass) DMRB Stage 3 Scheme Assessment Report Engineering, Traffic and Economic Assessment Volume 1 – Main Report and Appendices November 2016 A96 Dualling Inverness to Nairn (including Nairn Bypass) DMRB Stage 3 Scheme Assessment Report Engineering, Traffic and Economic Assessment A96 Dualling Inverness to Nairn (including Nairn Bypass) Project no: B2103500 Document title: DMRB Stage 3 Scheme Assessment Report Document No.: B2103500-HW-0100-RP-015 Revision: 0 Date: November 2016 Client name: Transport Scotland Client no: TS/MTRIPS/SER/2014/06 Project manager: Helen Gregory Author: Graeme Herd File name: http://ipe5.jacobs.com/sites/A96/stage3/WP02 DMRB Stage 3 Report/A96 I-N DMRB Stage 3 Report Vol 1 - Cover and Contents.docx Jacobs U.K. Limited 95 Bothwell Street Glasgow G2 7HX United Kingdom T +44 (0) 141 243 8000 www.jacobs.com © Crown copyright 2016. 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Document history and status Revision Date Description By Review Approved 0 29/11/16 Final Issue LF GAH EHG i A96 Dualling Inverness to Nairn (including Nairn Bypass) DMRB Stage 3 Scheme Assessment Report Engineering, Traffic and Economic Assessment Contents Part 1 – Environmental Statement Part 2 – Engineering, Traffic and Economic Assessment Volume 1 – Main Report and Appendices Glossary of Terms ................................................................................................................................................ iv Abbreviations ....................................................................................................................................................... vii 1 Introduction ............................................................................................................................................. 1-1 1.1 Overview ................................................................................................................................................... 1-1 1.2 Background to Proposed Scheme ............................................................................................................ 1-1 1.3 Scheme Objectives ................................................................................................................................... 1-2 1.4 The Proposed Scheme ............................................................................................................................. 1-2 1.5 DMRB Stage 3 Scheme Assessment Report ........................................................................................... 1-3 1.6 Do-Minimum Definition ............................................................................................................................. 1-3 1.7 References ............................................................................................................................................... 1-3 2 Existing Conditions ................................................................................................................................ 2-1 2.1 Overview ................................................................................................................................................... 2-1 2.2 Man-made Features ................................................................................................................................. 2-1 2.3 Existing Road Network ............................................................................................................................. 2-3 2.4 Other Carriageway Features .................................................................................................................... 2-7 2.5 Existing Structures .................................................................................................................................. 2-14 2.6 Public Utilities ......................................................................................................................................... 2-20 2.7 Existing Traffic Patterns.......................................................................................................................... 2-21 2.8 Existing Accident Data............................................................................................................................ 2-22 2.9 Operational Issues .................................................................................................................................. 2-23 2.10 References ............................................................................................................................................. 2-23 3 Description of the Proposed Scheme .................................................................................................. 3-1 3.1 Engineering Description ........................................................................................................................... 3-1 3.2 Cost Estimate ......................................................................................................................................... 3-11 3.3 References ............................................................................................................................................. 3-13 4 Engineering Assessment ...................................................................................................................... 4-1 4.1 Engineering Standards ............................................................................................................................. 4-1 4.2 Climate, Topography and Land Use ......................................................................................................... 4-3 4.3 Geology, Ground Conditions and Earthworks .......................................................................................... 4-4 4.4 Drainage, Hydrology and Hydrogeology ................................................................................................ 4-11 4.5 Public Utilities ......................................................................................................................................... 4-18 4.6 Structures ............................................................................................................................................... 4-20 4.7 Fencing and Environmental Barriers ...................................................................................................... 4-28 4.8 Traffic Signs and Road Markings, Traffic Signals and Lighting.............................................................. 4-28 4.9 Lay-Bys ................................................................................................................................................... 4-30 4.10 Road Restraint Systems ......................................................................................................................... 4-30 4.11 Road Pavement ...................................................................................................................................... 4-30 4.12 Indicative Construction Sequence .......................................................................................................... 4-31 ii A96 Dualling Inverness to Nairn (including Nairn Bypass) DMRB Stage 3 Scheme Assessment Report Engineering, Traffic and Economic Assessment 4.13 References ............................................................................................................................................. 4-33 5 Traffic Assessment ................................................................................................................................ 5-1 5.1 Introduction ............................................................................................................................................... 5-1 5.2 Model Inputs and Assumptions ................................................................................................................ 5-1 5.3 Existing Traffic Operational Review ......................................................................................................... 5-2 5.4 Accident Summary ................................................................................................................................... 5-4 5.5 Traffic Modelling ....................................................................................................................................... 5-5 6 Economic Assessment .......................................................................................................................... 6-1 6.1 Introduction ............................................................................................................................................... 6-1 6.2 Proposed Scheme Costs .........................................................................................................................