Land at Manydown,

MSD12aRA2: Transport Assessment Addendum ES Appendix 14.1 MSD13R: Environmental Statement Addendum Appendix K: Transport Assessment (Revised) Appendix P: Transport Assessment Second Addendum Revised December 2019

Appendix A: Junction Technical Notes

VS1 Rooksdown Junction summary technical note VS3 Trumpet Roundabout summary technical note VS4 Aldermaston Roundabout summary technical note VS5 Thornycroft Roundabout summary technical note VS6 West Ham summary technical note VS7 Buckskin Roundabout summary technical note VS8 Fiveways summary technical note VS9 Old Kempshott Lane summary technical note VS10 Roman Way Roundabout summary technical note VS12 Roundabout summary technical note VS14 Victory Roundabout summary technical note VS15 Wootton St Laurence summary technical note VS16 Upper Wootton summary technical note VS17 Kempshott Homesteads Rd summary technical note VS18 Park Prewett Road summary technical note VS19 Houndmills Roundabout summary technical note VS20 Ringway W Worting Rd (Left T-Junction) summary technical note VS20 Ringway W Worting Rd (Right T-Junction) summary technical note VS21 A339 George Street Little Knowl Hill summary technical note VS22 Union Lane Roundabout 03.12.2019 summary technical note VS23 Ashford Hill & JC26 Thornford Road Combined summary technical note VS24 A33 Ringway North Ringway East summary technical note VS27 A30 Kempshott Roundabout summary technical note Note: This document is JC25 A339 Crabs Hill summary technical note a revision and replaces JC28 A339 Basingstoke Road summary technical note MSD12zR submitted in July 2018.

shaping a place, creating a community MSD12aRA2 Transport Assessment Second Addendum Appendices Note: these appendices also form part of Appendix P to MSD13R ES Addendum 14.1

Appendix A - Junction Technical Notes - VS1 Rooksdown Junction summary technical note - VS3 Trumpet Roundabout summary technical note - VS4 Aldermaston Roundabout summary technical note - VS5 Thornycroft Roundabout summary technical note - VS6 West Ham summary technical note - VS7 Buckskin Roundabout summary technical note - VS8 Fiveways summary technical note - VS9 Old Kempshott Lane summary technical note - VS10 Roman Way Roundabout summary technical note - VS12 Winchester Roundabout summary technical note - VS14 Victory Roundabout summary technical note - VS15 Wootton St Laurence summary technical note - VS16 Upper Wootton summary technical note - VS17 Kempshott Homesteads Rd summary technical note - VS18 Park Prewett Road summary technical note - VS19 Houndmills Roundabout summary technical note - VS20 Ringway W Worting Rd (Left T-Junction) summary technical note - VS20 Ringway W Worting Rd (Right T-Junction) summary technical note - VS21 A339 George Street Little Knowl Hill summary technical note - VS22 Union Lane Roundabout 03.12.2019 summary technical note - VS23 Ashford Hill & JC26 Thornford Road Combined summary technical note - VS24 A33 Ringway North Ringway East summary technical note - VS27 A30 Kempshott Roundabout summary technical note - JC25 A339 Crabs Hill summary technical note - JC28 A339 Basingstoke Road summary technical note

Appendix B - Revised Public Transport Strategy

Appendix C - Walking and Cycling Technical Note

Appendix D - Journey Time Technical Note

Appendix E - Trip Distribution Diagrams

Appendix F - Trip Distribution Technical Note

Land at Manydown, Basingstoke 11/10/2019 Reference number MSD12A

TECHNICAL NOTE – WINCHESTER ROUNDABOUT (VS12) LAND AT MANYDOWN, BASINGSTOKE TECHNICAL NOTE – WINCHESTER ROUNDABOUT (VS12)

IDENTIFICATION TABLE County Council Property Services (HCCPS) and Client/Project owner Basingstoke and Deane Borough Council (BDBC) Project Land at Manydown, Basingstoke

Study Technical Note – Winchester Roundabout (VS12)

Type of document Report

Date 11/10/2019

Reference number MSD12A

APPROVAL

Version Name Position Date Modifications Assistant Author ES 07/03/2019 Consultant Checked 1st draft for 1 PM Consultant 16/04/2019 by client comment Approved HM Associate 17/05/2019 by Author CD Consultant 10/07/2019

Checked 2nd draft for 2 JS PD 10/07/2019 by comments Approved JS PD 10/07/2019 by Author CD Consultant 25/07/2019 Checked JS PD 25/07/2019 3 by Final for issue Approved JS PD 25/07/2019 by Author KD Consultant 11/10/2019 Checked Further HM Associate 11/10/2019 4 by Modelling Optimisation Approved JS PD 11/10/2019 by TABLE OF CONTENTS

1. WINCHESTER ROUNDABOUT (VS12) 4

1.1 INTRODUCTION 4

1.2 2016 BASELINE JUNCTION OPERATION 5

1.3 FUTURE YEAR TRAFFIC FLOWS 5

1.4 FUTURE YEAR JUNCTION OPERATION – 2031 SCENARIO 1 VS 2031 SCENARIO 2 (CONSERVATIVE) 6

1.5 SUMMARY 10

LIST OF FIGURES

Figure 1. Junction VS12 Location 5

LIST OF TABLES

Table 1. VS12 2031 Scenario 1 vs 2031 Scenario 2, Signalised Layout, AM Peak Hour 6 Table 2. VS12 2031 Scenario 1 vs 2031 Scenario 2, Current Signalised Layout, PM Peak Hour 8

Land at Manydown, Basingstoke Technical Note – Winchester Roundabout (VS12) MSD12A Report 11/10/2019 Page 3/11 1. WINCHESTER ROUNDABOUT (VS12)

1.1 Introduction

1.1.1 This technical note provides a consolidated overview of the junction analysis undertaken for Winchester Roundabout (VS12).

1.1.2 This technical note sets out the following:

 Summary of existing year (2016) analysis;  Summary of the development of future year traffic flows with and without Manydown; and  Summary of future year junction operation in 2031 with and without Manydown.

1.1.3 The Winchester Roundabout is currently a signalised, four arm roundabout, located to the south east of the site. The roundabout forms part of the local distributor / ring road system within Basingstoke, with the Ringway West arm directly connecting to junction VS5 (Thorneycroft roundabout). Figure 1 shows the roundabout location.

1.1.4 It is noted that the roundabout has been signalised as part of a series of upgrades undertaken by HCC since the on-site traffic surveys were undertaken in May 2016. These improvements were understood to be in development at the time of the preparation of the revised Main TA report (issued in June 2018), which models the junction in its unsignalised form.

1.1.5 A LinSig model of the signalised junction layout was subsequently provided by HCC for the purposes of updated testing of the impacts of the Manydown development. As such the content of this TN is new information. The conclusions drawn with regard to the need for mitigation have also been updated from those which are set out in the revised Main TA report.

Land at Manydown, Basingstoke Technical Note – Winchester Roundabout (VS12) MSD12A Report 11/10/2019 Page 4/11 Figure 1. Junction VS12 Location

1.2 2016 Baseline Junction Operation

1.2.1 The junction was originally surveyed in 2016. At the time of the surveys, the junction took the form of an unsignalized roundabout. Since the surveys were undertaken, HCC has implemented a signalisation scheme and as such the future year modelling of the junction has been undertaken in LinSig. Baseline model results for the unsignalized junction form are therefore not reproduced here as they represent a junction form which no longer exists and is therefore not relevant to the appraisal of the current junction’s performance.

1.3 Future Year Traffic Flows

1.3.1 The future year traffic flows have been developed in close consultation with HCC. The overarching methodology is based on the following:

 Use of the NHTM to derive the basis of 2031 flows with and without Manydown;  Change in flows between 2016 and 2031 from NHTM applied to the observed 2016 flows to create 2031 future base (Scenario 1);  Change in flows between 2031 with and without Manydown applied to the Scenario 1 flows to create 2031 with Manydown (Scenario 2); and  Further manual adjustments applied to those junctions affected by the volume of non-development trips that could use Main Street (as a set out in Chapter 4 of the Addendum TA).

Land at Manydown, Basingstoke Technical Note – Winchester Roundabout (VS12) MSD12A Report 11/10/2019 Page 5/11 1.3.2 The details of how they have been developed are set out in the TA (Chapter 11) and the Addendum TA (Chapter 4).

1.3.3 As set out in the TA, a number of different trip generation scenarios have been considered using varying mode share by car. For the purpose of the analysis set out in this Technical Note, the trip generation rates using a 70% mode share by car (previously named a “conservative”) scenario have been adopted.

1.3.4 For clarity, the two scenarios modelled are:

 Scenario 1 represents the future year flows in 2031 without Manydown; and  Scenario 2 represents the flows with Manydown, assuming 70% of trips by car and with 50% of non-development traffic using Main Street.

1.3.5 For avoidance of doubt, the junction does not fall within the main street diversion route and therefore is not directly affected in terms of its vehicle trip matrices.

1.4 Future Year Junction Operation – 2031 Scenario 1 vs 2031 Scenario 2 (Conservative)

1.4.1 Table 1 and Table 2 compare the 2031 Scenario 1 and Scenario 2 AM and PM peak hour junction modelling results for the signalised layout, using the Linsig Model provided by HCC; both scenarios have been optimised using the functions available within the model. Traffic flows associated with the Manydown development are included within Scenario 2.

Table 1. VS12 2031 Scenario 1 vs 2031 Scenario 2, Signalised Layout, AM Peak Hour

2031 SCENARIO 1 2031 SCENARIO 2 WITHOUT MANYDOWN WITH MANYDOWN LANE LANE MEAN MEAN ALLOCATION DESCRIPTION AV. AV. MAX MAX DOS (%) DELAY DOS (%) DELAY QUEUE QUEUE (S/PCU) (S/PCU) (PCU) (PCU)

A30 1/1 Winchester 61.6 22 10 61.6 22 10 Rd Left

A30 Winchester 1/2 62.0 22 10 62.1 22 10 Rd Left Ahead

A30 1/3 Winchester 44.5 18 6 54.3 20 8 Rd Ahead

A340 2/2+2/1 59.5 10 6 63.1 11 7 Ringway

Land at Manydown, Basingstoke Technical Note – Winchester Roundabout (VS12) MSD12A Report 11/10/2019 Page 6/11 2031 SCENARIO 1 2031 SCENARIO 2 WITHOUT MANYDOWN WITH MANYDOWN LANE LANE MEAN MEAN ALLOCATION DESCRIPTION AV. AV. MAX MAX DOS (%) DELAY DOS (%) DELAY QUEUE QUEUE (S/PCU) (S/PCU) (PCU) (PCU)

West Left Ahead

A340 2/3 Ringway 39.9 10 6 44.0 11 7 West Ahead

Winchester 3/1+3/2 Rd Left 47.8 4 2 47.4 5 2 Ahead

A30 Ringway 4/2+4/1 58.6 27 5 61.9 28 6 South Left Ahead

A30 Ringway 4/3 46.4 28 5 48.0 28 6 South Ahead

North Circ. 9/1 59.7 35 7 62.9 31 8 Ahead

North Circ. 9/2 37.7 29 5 40.2 24 5 Right

North Circ. 9/3 50.3 34 6 54.3 29 7 Right

South Circ. 11/1 43.3 9 4 43.7 9 5 Ahead

South Circ. 11/2 52.6 8 5 55.3 7 4 Ahead Right

South Circ. 11/3 16.1 9 2 14.2 9 1 Right

West Circ. 12/1 34.9 7 1 36.6 5 1 Ahead

Land at Manydown, Basingstoke Technical Note – Winchester Roundabout (VS12) MSD12A Report 11/10/2019 Page 7/11 2031 SCENARIO 1 2031 SCENARIO 2 WITHOUT MANYDOWN WITH MANYDOWN LANE LANE MEAN MEAN ALLOCATION DESCRIPTION AV. AV. MAX MAX DOS (%) DELAY DOS (%) DELAY QUEUE QUEUE (S/PCU) (S/PCU) (PCU) (PCU)

West Circ. 12/2 53.1 16 6 52.0 12 5 Ahead Right

Junction PRC: 45.2% Junction PRC: 42.7 %

Cycle Time: 80 seconds Cycle time: 80 seconds

1.4.2 The results show that the junction in its current signalised layout is expected to operate within capacity in the morning peak hour, both with and without the traffic generated by Manydown. A maximum degree of saturation (DoS) of 63.1% is predicted on the A340 Ringway West Left / Ahead lane.

1.4.3 Comparing the results of the analysis with and without Manydown the following conclusions can be drawn for the junction in its current signalised layout:

 The junction will operate similarly with the addition of the traffic generated by the Manydown development, with the additional traffic leading to slight increases in queues and delay on some arms; and  There is an overall small reduction is capacity with the addition of the forecasted development traffic.

Table 2. VS12 2031 Scenario 1 vs 2031 Scenario 2, Current Signalised Layout, PM Peak Hour

2031 SCENARIO 1 2031 SCENARIO 2 WITHOUT MANYDOWN WITH MANYDOWN LANE LANE MEAN MEAN ALLOCATION DESCRIPTION AV. AV. MAX DOS MAX DOS (%) DELAY DELAY QUEUE (%) QUEUE (S/PCU) (S/PCU) (PCU) (PCU)

A30 1/1 Winchester 39.3 13 6 45.6 18 6 Rd Left

A30 Winchester 1/2 39.8 13 6 46.3 18 7 Rd Left Ahead

Land at Manydown, Basingstoke Technical Note – Winchester Roundabout (VS12) MSD12A Report 11/10/2019 Page 8/11 2031 SCENARIO 1 2031 SCENARIO 2 WITHOUT MANYDOWN WITH MANYDOWN LANE LANE MEAN MEAN ALLOCATION DESCRIPTION AV. AV. MAX DOS MAX DOS (%) DELAY DELAY QUEUE (%) QUEUE (S/PCU) (S/PCU) (PCU) (PCU)

A30 1/3 Winchester 18.1 11 2 42.1 18 6 Rd Ahead

A340 Ringway 2/2+2/1 71.4 8 7 76.9 9 9 West Left Ahead

A340 2/3 Ringway 51.4 7 7 58.0 8 9 West Ahead

Winchester 3/1+3/2 Rd Left 41.3 6 2 47.3 8 2 Ahead

A30 Ringway 4/2+4/1 69.2 37 6 73.4 38 8 South Left Ahead

A30 Ringway 4/3 71.0 43 8 73.2 41 9 South Ahead

North Circ. 9/1 71.4 53 6 74.5 48 7 Ahead

North Circ. 9/2 35.8 40 3 58.3 37 5 Right

North Circ. 9/3 45.0 48 3 66.6 46 6 Right

South Circ. 11/1 52.2 8 5 56.9 9 7 Ahead

South Circ. 11/2 58.6 8 5 69.3 10 6 Ahead Right

Land at Manydown, Basingstoke Technical Note – Winchester Roundabout (VS12) MSD12A Report 11/10/2019 Page 9/11 2031 SCENARIO 1 2031 SCENARIO 2 WITHOUT MANYDOWN WITH MANYDOWN LANE LANE MEAN MEAN ALLOCATION DESCRIPTION AV. AV. MAX DOS MAX DOS (%) DELAY DELAY QUEUE (%) QUEUE (S/PCU) (S/PCU) (PCU) (PCU)

South Circ. 11/3 7.5 6 1 6.1 6 0 Right

West Circ. 12/1 41.5 5 2 38.5 4 3 Ahead

West Circ. 12/2 61.2 13 5 50.2 7 5 Ahead Right

Junction PRC: 26.0% Junction PRC: 17.0%

Cycle Time: 80 seconds Cycle time: 80 seconds

1.4.4 The results show that junction is expected to operate within capacity in the evening peak hour, with and without Manydown traffic. The maximum DoS is 76.9% with corresponding queue of 9 PCUs on A340 Ringway West Left / Ahead lane.

1.4.5 Comparing the results of the analysis with and without Manydown the following conclusions can be drawn for the junction in its signalised layout:

 The inclusion of Manydown traffic leads to increased queuing and delay on several arms, but this remains within the junction’s overall capacity; and  A majority of the junction arms are only modestly impacted by the addition of Manydown traffic with the optimised signal timing arrangement, with some arms showing an improvement over S1.

1.5 Summary

1.5.1 Following review of the January 2019 TA Addendum, HCC provided a LinSig model of the junction to reflect the recently implemented improvement scheme. This model has been used to assess the operation of the junction using future year flows including the impact of Manydown.

1.5.2 The results of the modelling show that the current signalised layout will operate in a satisfactory manner in the AM and PM peak with the Manydown development, subject to optimisation of the signal timings to reflect the anticipated changes in vehicle numbers and proportions across the junction. As such, no physical mitigation proposals have been put forward for this junction.

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