S SPELTHORNE BOROUGH COUNCIL LOCAL PLAN Strategic Highway Assessment Part 2: Results and Analysis Spelthorne Borough Council Local Plan Strategic Highway Assessment Part 2: Results and Analysis Project Title: Spelthorne Borough Council Local Plan Document Title: Strategic Highway Assessment Part 2: Results and Analysis Date: 11/10/19 Prepared By: Samuel Pink Authorised By: William Bryans All maps contained in this document are licensed © Crown copyright and database rights 2018 Ordnance Survey 100019613 and are orientated to grid north Amendment List Iss. / Amendment List Rev. 0201SF10 07/08/02 Filename: S:\Project-current\3000 PROJECT NOS STARTING WTIH 3000\3613\53613T52_Spelthorne_2019\02_Reports Issue No. 03 Page 2 Document No. 53613T52/02 Spelthorne Borough Council Local Plan Strategic Highway Assessment Part 2: Results and Analysis CONTENTS 1 INTRODUCTION ................................................................................................................................... 6 1.1 REGULATION 18 APPRAISAL ..................................................................................................................... 6 1.2 ORGANISATION OF THIS REPORT ................................................................................................................ 6 2 RESULTS AND ANALYSIS ...................................................................................................................... 7 2.1 OVERVIEW ............................................................................................................................................ 7 2.2 SCENARIO OVERVIEW .............................................................................................................................. 7 2.3 SELECT LINK ANALYSIS ........................................................................................................................... 11 2.4 LEVEL OF SERVICE (LOS) METRIC ............................................................................................................. 19 2.5 LINK ANALYSIS ..................................................................................................................................... 19 2.6 INCREASE IN JUNCTION DELAY ................................................................................................................. 30 2.7 THE STRATEGIC HIGHWAY NETWORK ....................................................................................................... 43 2.8 CROSS BOUNDARY IMPACTS ................................................................................................................... 58 2.9 NETWORK HOTSPOTS AND MITIGATION .................................................................................................... 69 3 OVERVIEW OF FINDINGS ................................................................................................................... 72 3.2 KEY POINTS ......................................................................................................................................... 72 Issue No. 03 Page 3 Document No. 53613T52/02 Spelthorne Borough Council Local Plan Strategic Highway Assessment Part 2: Results and Analysis TABLE OF FIGURES FIGURE 2-1 AM PEAK HOUR TOTAL VEHICLE-KILOMETRES PER SCENARIO FOR SPELTHORNE BOROUGH ................................. 8 FIGURE 2-2 PM PEAK HOUR TOTAL VEHICLE-KILOMETRES PER SCENARIO FOR SPELTHORNE BOROUGH .................................. 8 FIGURE 2-3 AM PEAK HOUR TOTAL VEHICLE-HOURS PER SCENARIO FOR SPELTHORNE BOROUGH ........................................ 9 FIGURE 2-4 PM PEAK HOUR TOTAL VEHICLE-HOURS PER SCENARIO FOR SPELTHORNE BOROUGH ......................................... 9 FIGURE 2-5 AM PEAK HOUR AVERAGE LINK SPEED FOR SPELTHORNE BOROUGH ............................................................. 10 FIGURE 2-6 PM PEAK HOUR AVERAGE LINK SPEED FOR SPELTHORNE BOROUGH ............................................................. 10 FIGURE 2-7 SCENARIO C SELECT LINK ANALYSIS OF LAND OFF WORPLE ROAD, WORPLE ROAD (256 DWELLINGS). ................. 14 FIGURE 2-8 SCENARIO C SELECT LINK ANALYSIS OF LAND TO SOUTH AND WEST OF STRATTON ROAD, STRATTON ROAD (245 DWELLINGS). ............................................................................................................................................... 15 FIGURE 2-9 SCENARIO C SELECT LINK ANALYSIS OF LAND TO SOUTH OF ASHFORD COMMON WATER TREATMENT WORKS, CHARLTON ROAD (200 DWELLINGS). ............................................................................................................... 16 FIGURE 2-10 SCENARIO D SELECT LINK ANALYSIS OF KEMPTON PARK (3,000 DWELLINGS). ............................................... 17 FIGURE 2-11 LINK FLOW DIFFERENCE PLOTS, SCENARIO B COMPARED WITH SCENARIO A ................................................. 21 FIGURE 2-12 LINK FLOW DIFFERENCE PLOTS, SCENARIO C COMPARED WITH SCENARIO A ................................................. 22 FIGURE 2-13 LINK FLOW DIFFERENCE PLOTS, SCENARIO D COMPARED WITH SCENARIO A ................................................. 23 FIGURE 2-14: LINK FLOW DIFFERENCE PLOTS BETWEEN SCENARIOS A AND D AT KEMPTON PARK. ........................................ 25 FIGURE 2-15 LINK LEVEL OF SERVICE FOR SCENARIO A AM AND PM PEAK HOUR ............................................................. 27 FIGURE 2-16: AM PEAK HOUR LOS SCENARIO A VS SCENARIO D .................................................................................. 28 FIGURE 2-17: PM PEAK HOUR LOS SCENARIO A VS SCENARIO D .................................................................................. 29 FIGURE 2-18: DELAY IN SECONDS PER VEHICLE AT JUNCTIONS WITHIN THE BOROUGH WITH A LOS VALUE OF C – D DURING THE DO MINIMUM SCENARIO A. ................................................................................................................................ 30 FIGURE 2-19 M25 JUNCTION 13 FLOW DIFFERENCE PLOT BETWEEN SCENARIO B AND SCENARIO A FOR BOTH THE AM AND PM PEAK HOURS. ............................................................................................................................................... 45 FIGURE 2-20 M25 JUNCTION 13 FLOW DIFFERENCE PLOT BETWEEN SCENARIO C AND SCENARIO A FOR BOTH THE AM AND PM PEAK HOURS. ............................................................................................................................................... 46 FIGURE 2-21 M25 JUNCTION 13 FLOW DIFFERENCE PLOT BETWEEN SCENARIO D AND SCENARIO A FOR BOTH THE AM AND PM PEAK HOURS. ............................................................................................................................................... 47 FIGURE 2-22 A30 FLOW DIFFERENCE PLOT OF SCENARIO B VS SCENARIO A FOR BOTH THE AM AND PM PEAK HOURS.WITH AN INSERT SHOWING THE CROOKED BILLET ROUDABOUT. ......................................................................................... 48 FIGURE 2-23 A30 FLOW DIFFERENCE PLOT OF SCENARIO C VS SCENARIO A FOR BOTH THE AM AND PM PEAK HOURS WITH AN INSERT SHOWING THE CROOKED BILLET ROUNDABOUT. ....................................................................................... 49 FIGURE 2-24 A30 FLOW DIFFERENCE PLOT OF SCENARIO D VS SCENARIO A FOR BOTH THE AM AND PM PEAK HOURS WITH AN INSERT SHOWING THE CROOKED BILLET ROUNDABOUT. ....................................................................................... 50 FIGURE 2-25 M3 FLOW DIFFERENCE PLOT OF SCENARIO B VS SCENARIO A FOR BOTH THE AM AND PM PEAK HOURS WITH AN INSERT SHOWING THE SUNBURY CROSS ROUNDABOUT. ....................................................................................... 51 FIGURE 2-26 M3 FLOW DIFFERENCE PLOT OF SCENARIO C VS SCENARIO A FOR BOTH THE AM AND PM PEAK HOURS WITH AN INSERT SHOWING THE SUNBURY CROSS ROUNDABOUT. ....................................................................................... 52 FIGURE 2-27: M3 FLOW DIFFERENCE PLOT OF SCENARIO D VS SCENARIO A FOR BOTH THE AM AND PM PEAK HOURS WITH AN INSERT SHOWING THE SUNBURY CROSS ROUNDABOUT. ....................................................................................... 53 TABLE OF TABLES TABLE 2-1 VEHICLE TRIP MATRIX TOTALS BY SCENARIO WITH DIFFERENCES FROM SCENARIO A............................................. 7 TABLE 2-2 INTERPRETATION OF LEVEL OF SERVICE CATEGORIES ..................................................................................... 19 TABLE 2-3: DO MINIMUM SCENARIO A AM PEAK HOUR JUNCTIONS CLASSIFIED AS LOS C – D ............................................ 32 TABLE 2-4: DO MINIMUM SCENARIO A PM PEAK HOUR JUNCTIONS CLASSIFIED AS LOS C – D ............................................ 35 TABLE 2-5: SCENARIO B VS SCENARIO A JUNCTION PERFORMANCE DURING THE AM ASSESSED HOUR. JUNCTIONS WITH A DETERIORATION TO LOS C/D AND/OR INCREASED JUNCTION DELAY OF >1 SECOND. .................................................. 37 TABLE 2-6: SCENARIO B VS SCENARIO A JUNCTION PERFORMANCE DURING THE PM ASSESSED HOUR. JUNCTIONS WITH A DETERIORATION TO LOS C/D AND/OR INCREASED JUNCTION DELAY OF >1 SECOND. .................................................. 37 TABLE 2-7: SCENARIO C VS SCENARIO A JUNCTION PERFORMANCE DURING THE AM ASSESSED HOUR. JUNCTIONS WITH A DETERIORATION TO LOS C/D AND/OR INCREASED JUNCTION DELAY OF >1 SECOND. .................................................. 38 Issue No. 03 Page 4 Document No. 53613T52/02 Spelthorne Borough Council Local Plan Strategic Highway Assessment Part 2: Results and Analysis TABLE 2-8: SCENARIO C VS SCENARIO