srtm modelling data extraction of …...1.2.2 in december 2017, ebc commissioned systra to undertake...

Eastleigh Local Plan 31/07/2018

Reference number 105599

SRTM MODELLING – DATA EXTRACTION OF JUNCTIONS IN SOUTHAMPTON BASED ON THE DO SOMETHING 3 SCENARIO

EASTLEIGH LOCAL PLAN SRTM MODELLING – DATA EXTRACTION OF JUNCTIONS IN SOUTHAMPTON

BASED ON THE DO SOMETHING 3 SCENARIO

IDENTIFICATION TABLE

Client/Project owner Eastleigh Borough Council

Project Eastleigh Local Plan

Study SRTM Modelling – Data Extraction of Junctions in Southampton based on the Do Something 3 Scenario

Type of document Results of Further Data Extraction

Date 31/07/2018

File name 180731_Eastleigh Local Plan Southampton Junctions.docx

Reference number 105599

Number of pages 22

APPROVAL

Version Name Position Date Modifications

1

Author Michael Hornung

Consultant 31/07/2018

Checked by

Claire Stephens Associate 02/08/2018

Approved by

Claire Stephens Associate 02/08/2018

Eastleigh Local Plan Do Something 3 – Southampton Extracts 105599

Results of Further Data Extraction 31/07/2018 /22

TABLE OF CONTENTS

1. INTRODUCTION 5

1.1 INTRODUCTION 5

1.2 STUDY BACKGROUND 5

2. DATA EXTRACTION 6

2.1 LIST OF JUNCTIONS 6

2.2 ASSESSMENT CRITERIA 7

2.3 JUNCTION IMPACTS 7

2.4 DETAILED LIST OF JUNCTIONS 8

2.5 HIGHWAY FLOW DIFFERENCE PLOTS – SOUTHAMPTON 19



LIST OF FIGURES

Figure 1. 2036 DS3 (DPP) vs Baseline (DOP) Flow Difference – AM Peak 20 Figure 2. 2036 DS3 (DPP) vs Baseline (DOP) Flow Difference – PM Peak 21

LIST OF TABLES

Table 1. 2036 Do Something 3 - Locations of Significant or Severe Impact 8 Table 2. Bassett Avenue/A27 Bassett Green Road/M3 J14 (Chilworth Roundabout) AM Peak Junction Performance 9 Table 3. Bassett Avenue/A27 Bassett Green Road/M3 J14 (Chilworth Roundabout) PM Peak Junction Performance 9 Table 4. A33 Bassett Avenue/A35 Winchester Road AM Peak Junction Performance 10 Table 5. A33 Bassett Avenue/A35 Winchester Road PM Peak Junction Performance 10 Table 6. A33 Bassett Avenue/A35 Burgess Road AM Peak Junction Performance 11 Table 7. A33 Bassett Avenue/A35 Burgess Road PM Peak Junction Performance 11 Table 8. A35 Burgess Rd/High Rd/Stoneham Way AM Peak Junction Performance 12 Table 9. A35 Burgess Rd/High Rd/Stoneham Way PM Peak Junction Performance 12 Table 10. Stoneham Way/Stoneham Ln AM Peak Junction Performance 13 Table 11. Stoneham Way/Stoneham Ln PM Peak Junction Performance 13 Table 12. A335 Stoneham Way/A335 Thomas Lewis Way AM Peak Junction Performance 14 Table 13. A335 Stoneham Way/A335 Thomas Lewis Way PM Peak Junction Performance 14 Table 14. A335 Stoneham Way/A27 Wide Ln/Bassett Green Rd AM Peak Junction Performance 15 Table 15. A335 Stoneham Way/A27 Wide Ln/Bassett Green Rd PM Peak Junction Performance 15 Table 16. A27 Kanes Hill/A334 Thornhill Park Road AM Peak Junction Performance 16 Table 17. A27 Kanes Hill/A334 Thornhill Park Road PM Peak Junction Performance 16 Table 18. A334 Thornhill Park Road/Hinkler Road AM Peak Junction Performance 18 Table 19. A334 Thornhill Park Road/Hinkler Road PM Peak Junction Performance 18



1. INTRODUCTION

1.1 Introduction

1.1.1 Eastleigh Borough Council (EBC) commissioned SYSTRA to undertake strategic modelling using the Solent Transport’s Sub-Regional Traffic Model (SRTM) to test the traffic impacts of a range of development options as part of its Local Plan process.

1.1.2 The SRTM was developed to support a wide-ranging set of interventions across the Solent Transport sub-region, and is specifically required to be capable of:

Forecasting changes in travel demand, road traffic, public transport patronage and active mode use over time as a result of changing economic conditions, land-use policies and development, and transport improvement and interventions (schemes);

Testing the impacts of land-use and transport policies and strategies within a relatively short model run time; and

Testing the impacts of individual transport interventions in the increased detail necessary for preparing submissions for inclusion in funding programmes.

1.1.3 All outputs in this report focus on 2036 forecast conditions. This narrative summarises the key SRTM modelling assumptions and presents the modelling results.

1.2 Study Background

1.2.1 The SRTM was previously used to undertake a Baseline (committed development) and a number of Do Minimum (Local Plan additional development allocations) scenarios for 2036. In July 2017, the emerging Local Plan strategy of a 5,200 dwelling Strategic Growth Option (SGO) site north of Bishopstoke / North East of Fair Oak (SGO sites B and C), alongside provision of a new northern link road between M3 J12 and Fair Oak, via Allbrook was initially proposed.

1.2.2 In December 2017, EBC commissioned SYSTRA to undertake an Interim Do Something SRTM scenario that included a range of highway interventions to support the full Council in making a decision on the SGO site.

1.2.3 On December 11th 2017, the Council agreed that the Local Plan for submission will feature a strategic growth option of around 5,200 dwellings at North Bishopstoke / North East of Fair Oak which will enable achievement of the Council’s housing delivery targets. This is subject to completion of evidence, including a Transport Assessment.

1.2.4 The focus of the study reported in the transport assessment was the impact of potential packages of “off-site” infrastructure schemes to mitigate congestion impacts resulting from the Local Plan. Traffic flow data output from the SRTM also formed inputs to an ecology and air quality assessment that was reported by a third party in a separate document.

1.2.5 Alongside the preferred development option, a number of other development options have been specified by EBC and modelled using the SRTM.

1.2.6 On 25th July 2018, EBC commissioned SYSTRA to undertake further data extraction on defined junctions in Southampton based on the existing Do Something 3 Scenario. The



outputs will be presented in tables highlighting the RFC and indicating which junction arms will have significant or severe impacts compared to the 2036 Baseline. This document also includes flow difference plots.

1.2.7 This document presents the results from the additional data extraction from DS3, but does not provide commentary to the level presented within the Transport Assessment.

2. DATA EXTRACTION

2.1 List of Junctions

2.1.1 The junctions in Southampton for which further data extraction has been undertaken are as follows:

A33 Bassett Avenue/A27 Bassett Green Road/M3 J14 Rbt (Chilworth Rbt) A33 Bassett Avenue/A35 Winchester Road Rbt A33 Bassett Avenue/A35 Burgess Road Sgn A35 Burgess Rd/High Rd/Stoneham Way Sgn Stoneham Way/Stoneham Ln Sgn A335 Stoneham Way/A335 Thomas Lewis Way Sgn A335 Stoneham Way/A27 Wide Ln/Bassett Green Rd Sgn A27 Kanes Hill/A334 Thornhill Park Road Rbt A334 Thornhill Park Road/Hinkler Road Sgn



2.2 Assessment Criteria

2.2.1 To provide a consistent measure of the impacts arising from the Local Plan proposals all scenarios previously modelled have been assessed against the criteria below (these criteria match those applied to other SRTM commissions relating to Local Plan TAs). Volume to Capacity (V/C) is reported as a percentage to express the forecast take-up of available highway capacity at individual locations - hence identifying links with a high V/C is a proxy for identifying junctions with capacity issues:

a junction where the ratio of volume to capacity (V/C) on any approach arm was 85% or more in the Do-Something or Do-More scenario and has increased by 5% or more compared with the Baseline scenario, is considered as experiencing a significant impact;

a junction where the ratio of volume to capacity (V/C) on any approach arm was 95% or more in the Do-Something or Do-More scenario and has increased by 10% or more compared with the Baseline scenario, is considered as experiencing a severe impact;

a junction where the average delay per vehicle in the Do-Something or Do-More scenario was two minutes or more in any period and has increased by one minute or more compared with the Baseline scenario, is considered as experiencing a severe impact.

2.3 Junction Impacts

2.3.1 Table 1 below shows where significant or severe impacts are expected to occur based on the assessment criteria above.

2.3.2 Only one junction is forecast a significant impact (A334 Thornhill Park Road/Hinkler Road Sgn).



Table 1. 2036 Do Something 3 - Locations of Significant or Severe Impact

LINK/JUNCTION

ID BASELINE DS 3

AM PM AM PM

A33 Bassett Avenue/A27 Bassett Green Road/M3 J14 Rbt (Chilworth Rbt)

116

A33 Bassett Avenue/A35 Winchester Road Rbt 117

A33 Bassett Avenue/A35 Burgess Road Sgn 118

A35 Burgess Rd/High Rd/Stoneham Way Sgn 119

Stoneham Way/Stoneham Ln Sgn 120

A335 Stoneham Way/A335 Thomas Lewis Way Sgn

121

A335 Stoneham Way/A27 Wide Ln/Bassett Green Rd Sgn

122

A27 Kanes Hill/A334 Thornhill Park Road Rbt 123

A334 Thornhill Park Road/Hinkler Road Sgn 124 Sig

TOTALS

Sig

1 0 0 0

1 0

Sev

0 0 0 0

0 0

2.4 Detailed List of Junctions

2.4.1 The following tables summarise the AM and PM peak hour performance statistics, by arm, for the Baseline (BL) and the Do Something 3 (DS3) Scenario. Where assessment criteria for “significant” or “severe” impacts are met, these are highlighted in yellow and red respectively.

2.4.2 As shown above, the only junction identified with a significant impact is forecast in the AM peak for the westbound A334 Thornhill Park Road approach to the signalised junction.



Bassett Avenue/A27 Bassett Green Road/M3 J14 (Chilworth Roundabout)

Table 2. Bassett Avenue/A27 Bassett Green Road/M3 J14 (Chilworth Roundabout) AM Peak Junction Performance

AM PEAK

(ARM)

V/C (%) AVE QUEUE (PCU)

DELAY (S/PCU)

BL DS3 BL DS3 BL DS3

SB A27 106 106 78 90 110 123

WB A27 Basset Green Rd 108 108 11 10 250 259

NB A33 Bassett Ave 105 105 62 62 102 101

Table 3. Bassett Avenue/A27 Bassett Green Road/M3 J14 (Chilworth Roundabout) PM Peak Junction Performance

PM PEAK

(ARM)


DELAY (S/PCU)


SB A27 106 106 77 83 117 126

WB A27 Basset Green Rd 100 100 7 7 78 83

NB A33 Bassett Ave 100 100 7 6 17 15



A33 Bassett Avenue/A35 Winchester Road

Table 4. A33 Bassett Avenue/A35 Winchester Road AM Peak Junction Performance

AM PEAK

(ARM)


DELAY (S/PCU)


SB A33 Bassett Ave 110 110 89 90 185 187

NB A33 Bassett Ave 99 97 6 5 22 18

EB A35 Winchester Rd 111 109 58 50 234 194

Table 5. A33 Bassett Avenue/A35 Winchester Road PM Peak Junction Performance

PM PEAK

(ARM)


DELAY (S/PCU)


SB A33 Bassett Ave 107 107 65 68 142 148

NB A33 Bassett Ave 75 75 1 1 8 8

EB A35 Winchester Rd 101 101 15 16 52 55



A33 Bassett Avenue/A35 Burgess Road

Table 6. A33 Bassett Avenue/A35 Burgess Road AM Peak Junction Performance

AM PEAK

(ARM)


DELAY (S/PCU)


SB A33 Bassett Ave 79 76 10 10 47 46

WB A35 Burgess Rd 102 103 16 17 173 182

NB The Avenue 98 98 13 13 65 66

EB A35 Burgess Rd 108 106 29 26 278 240

Table 7. A33 Bassett Avenue/A35 Burgess Road PM Peak Junction Performance

PM PEAK

(ARM)


DELAY (S/PCU)


SB A33 Bassett Ave 59 58 7 7 41 41

WB A35 Burgess Rd 99 100 8 8 124 133

NB The Avenue 99 99 12 12 74 74

EB A35 Burgess Rd 97 97 9 9 99 102



A35 Burgess Rd/High Rd/Stoneham Way

Table 8. A35 Burgess Rd/High Rd/Stoneham Way AM Peak Junction Performance

AM PEAK

(ARM)


DELAY (S/PCU)


SB Stoneham Way 21 20 2 2 16 16

NB High Rd 42 45 2 2 44 44

EB A35 Burgess Rd 46 45 2 2 18 18

Table 9. A35 Burgess Rd/High Rd/Stoneham Way PM Peak Junction Performance

PM PEAK

(ARM)


DELAY (S/PCU)



NB High Rd 28 29 1 1 54 54

EB A35 Burgess Rd 40 39 2 2 10 10



Stoneham Way/Stoneham Ln

Table 10. Stoneham Way/Stoneham Ln AM Peak Junction Performance

AM PEAK

(ARM)


DELAY (S/PCU)



NB Stoneham Way 47 47 5 5 25 26

EB Stoneham Lane 46 47 3 3 43 43

Table 11. Stoneham Way/Stoneham Ln PM Peak Junction Performance

PM PEAK

(ARM)


DELAY (S/PCU)



NB Stoneham Way 36 36 3 3 21 21

EB Stoneham Lane 34 36 2 2 44 44



A335 Stoneham Way/A335 Thomas Lewis Way

Table 12. A335 Stoneham Way/A335 Thomas Lewis Way AM Peak Junction Performance

AM PEAK

(ARM)


DELAY (S/PCU)


WB A335 Stoneham Way 106 106 51 52 168 171

NB A335 Thomas Lewis Way

70 70 10 10 65 64

EB Stoneham Way 26 27 2 2 11 11

Table 13. A335 Stoneham Way/A335 Thomas Lewis Way PM Peak Junction Performance

PM PEAK

(ARM)


DELAY (S/PCU)


WB A335 Stoneham Way 102 103 23 26 104 111

NB A335 Thomas Lewis Way

58 59 8 8 42 43

EB Stoneham Way 25 24 2 2 11 11



A335 Stoneham Way/A27 Wide Ln/Bassett Green Rd

Table 14. A335 Stoneham Way/A27 Wide Ln/Bassett Green Rd AM Peak Junction Performance

AM PEAK

(ARM)


DELAY (S/PCU)


SB A335 Stoneham Way 89 90 8 8 30 31

WB A27 Wide Ln 81 79 4 4 36 35

NB A335 Stoneham Way 97 99 20 15 74 72

EB A27 Bassett Green Rd 22 21 1 1 18 17

Table 15. A335 Stoneham Way/A27 Wide Ln/Bassett Green Rd PM Peak Junction Performance

PM PEAK

(ARM)


DELAY (S/PCU)


SB A335 Stoneham Way 98 98 13 12 59 59

WB A27 Wide Ln 63 64 3 3 30 30

NB A335 Stoneham Way 96 90 9 9 51 34

EB A27 Bassett Green Rd 24 23 1 1 17 17



A27 Kanes Hill/A334 Thornhill Park Road

Table 16. A27 Kanes Hill/A334 Thornhill Park Road AM Peak Junction Performance

AM PEAK

(ARM)


DELAY (S/PCU)


SB Approach A27 Moorhill Rd

74 77 9 8 42 35

WB Approach Charles Watts Way

49 49 23 22 119 115

WB Approach Comines Way

32 34 1 1 9 9

NB Approach A27 Kanes Hill

75 65 2 2 11 11

EB Approach Thornhill Park Rd

102 98 25 9 77 33

Table 17. A27 Kanes Hill/A334 Thornhill Park Road PM Peak Junction Performance

PM PEAK

(ARM)


DELAY (S/PCU)


SB Approach A27 Moorhill Rd

67 72 6 8 29 33

WB Approach Charles Watts Way

66 67 39 40 178 181

WB Approach Comines Way

29 33 0 0 8 8



PM PEAK

(ARM)


DELAY (S/PCU)


NB Approach A27 Kanes Hill

57 58 2 3 11 15

EB Approach Thornhill Park Rd

84 85 9 10 30 32



A334 Thornhill Park Road/Hinkler Road

Table 18. A334 Thornhill Park Road/Hinkler Road AM Peak Junction Performance

AM PEAK

(ARM)


DELAY (S/PCU)


NB Hinkler Rd 99 101 0 4 99 124

EB A334 Thornhill Park Rd 96 100 2 3 49 72

WB A334 Thornhill Park Rd 87 96 9 3 25 42

Table 19. A334 Thornhill Park Road/Hinkler Road PM Peak Junction Performance

PM PEAK

(ARM)


DELAY (S/PCU)


NB Hinkler Rd 87 88 1 1 61 63

EB A334 Thornhill Park Rd 95 95 3 3 38 40

WB A334 Thornhill Park Rd 83 85 2 2 18 20



2.5 Highway Flow Difference Plots – Southampton

2.5.1 Figures 1 and 2 show the change in traffic flow (PCUs) in the AM and PM peak hours between the Baseline and the Do Something 3 scenario, at an overall district level for Southampton.



Figure 1. 2036 DS3 (DPP) vs Baseline (DOP) Flow Difference – AM Peak

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Figure 2. 2036 DS3 (DPP) vs Baseline (DOP) Flow Difference – PM Peak

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srtm modelling data extraction of …...1.2.2 in december 2017, ebc commissioned systra to undertake...

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