Wembley Sports Park Integrated Access, Traffic and Car Parking Plan

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AECOMWembley Sports Park Integrated Access, Traffic and Car Parking Plan375.6 Site Access AnalysisThe Northern (Salvado Road), Main (Selby / Alderbury Street) and left-in / left-out accesses were analysed for thepeak hourly traffic on Winter Saturdays. The Main Access was also analysed for the peak hour (PM peak) duringweekdays. Refer to Section 4.6 for the intersection layouts. The intersection turning volumes were derived as acombination of:The development traffic based on the trip generation and distribution discussed in Section 5.2 andSection 5.5 respectively; and The background traffic discussed in Section 2.4.The intersections were analysed using SIDRA Intersection Software for the peak 15-minutes within the peakhourly flows. These flows were derived from the frequency distributions, established in 5-minute intervals, asillustrated in Figure 16. The detailed analysis results are included in Appendix B. The summary results and keyfindings are presented below.Northern Access (Salvado Road)The analysis indicated (refer to Table 8) that the Northern Access is likely to operate at, or over, capacity duringthe peak hours on Winter Saturdays. Since the Access is anticipated to be operational on demand only (i.e. onWinter Saturdays), no analysis was done for normal weekdays.Table 7Performance summary for Northern Access (Salvado Road)TimeDayDemandFlow (vph)OverallDoSAverageDelay (s)LoSApproach /MovementWorst MovementDelay(s)Queue(m)9:30-10:30 Winter Sat 1,364 1.218 35.1 E South / RT 150.1 182.913:30-14:30 WinterSat13:30-14:30 b WinterSatStage 1 1,532 1.734 74.6 F South / RT 380.9 321.9Stage 2 1,574 1.861 83.4 F South / RT 439.7 345.8Stage 1 1,413 0.985 16.7 C South / RT 90.6 71.0Stage 2 1,455 1.057 19.3 C South / RT 114.0 86.315:00-16:00 Winter Sat 1,422 1.371 47.5 E South / RT 216.1 234.4PM Peak Weekday Free flow on Salvado Road, access to Wembley Sports Park closedNotes:b With additional traffic diverted from Salvado Road EntranceThe forecast overall Levels of Service (LoS) are E or F with a Degree of Saturation (DoS) of up to 1.734. Thecritical movement is the south approach right turn with anticipated average delays of up to 380.9 seconds. Theright turn demand, based on the assumed traffic distribution (refer to Section 5.5), was 116, 88 and 88vphrespectively for the three peak hours analysed. It was found that, if controlled by capacity, these demands wouldreduce to 90, 50 and 60vph respectively; with the surplus demands redistributing to the Main Access. Even ifthese demands will not reduce as much as suggested, the oversaturated conditions are expected to be relativelyshort in duration and the associated queues are expected to dissipate relatively quickly.If the traffic would redistribute as suggested, the average delay will reduce, for example, from 380.9 seconds to90.6 seconds as shown in Table 7. The effect of traffic redistribution on the Main Access is discussed in the nextsection.Main Access (Selby Street / Alderbury Street intersection)The proposed signalised intersection at the Main Access was analysed for the peak hours during WinterSaturdays and the peak hour (PM peak) on normal weekdays. The base analysis assumed that all pedestrianphases will operate each cycle in the peak hour. Since this is unlikely to occur, analysis was also done assumingno pedestrian calls will be received during the peak hour. The likely scenario is that several calls may be receivedduring the peak hour and thus the actual results are therefore likely to be between the two sets of results.Additional analysis was also done to test the capacity of the intersection to service overflow traffic from theNorthern Access. The key results from the analysis are summarised in Table 8.T:\60218676 - Wembley PK TA\8 Issued Docs\8.1 Reports\Comprehensive Integrated Access RevF.docxRevision F - 8 February 2012
AECOMWembley Sports Park Integrated Access, Traffic and Car Parking Plan38Table 8Performance summary for Main AccessTimeDayDemandFlow (vph)OverallDoSAverageDelay (s)LoSApproach /MovementWorst MovementDelay(s)Queue(m)9:00-10:00 Winter Sat 2,966 1.000 55.8 E North / T 68.6 205.811:00-12:00 Winter Sat 3,087 0.914 50.5 D South / RT 68.0 118.711:00-12:00 a Winter Sat 3,087 0.816 31.7 C East / RT 49.8 58.014:00-15:00 WinterSat14:00-15:00 b WinterSat14:00-15:00 b a WinterSatStage 1 3,205 1.000 62.2 E South / RT 75.5 186.7Stage 2 3,264 1.000 65.1 E South / LT 78.8 221.4Stage 1 3,300 1.000 65.3 E South / RT 87.1 200.1Stage 2 3,359 1.016 69.0 E South / RT 93.5 232.5Stage 1 3,300 0.970 47.5 D South / RT 59.3 148.0Stage 2 3,359 0.970 47.5 D South / RT 57.3 159.6AM Peak Weekday 3,027 0.894 41.3 D South / RT 90.7 103.8AM Peak a Weekday 3,027 0.806 23.8 C West / L 66.8 34.1PM Peak Weekday 3,064 0.916 48.8 D South / RT 85.4 148.2PM Peak a Weekday 3,064 0.798 28.0 C East / RT 64.5 7.3Notes:a No pedestrian callbWith additional traffic diverted from Salvado Road EntranceThe results suggest that the intersection will operate at LoS D or E with DoS of up to 1.000 and overall averagedelays of up to 62.2 seconds if all pedestrian phases run each cycle. The critical movements differ between thepeak hours. The south approach right turn is expected to be the worst with delays of up to 75.5 seconds whenpedestrian calls are received each time. In these cases the 95 th percentile back of queue may exceed theavailable storage in the proposed 120m long right turn pocket.If traffic redistributes from the Northern Access to the Selby – Alderbury intersection the overall average delay isforecast to increase during the critical peak hour (14:00 - 15:00) by 3.1 seconds without exceeding the capacity ofthe intersection; assuming all pedestrian phases are required each cycle. If no pedestrian phases are requiredduring that particular peak, the overall average delay will improve by 17.8 seconds and the overall LoS willimprove from E to D.Further analysis was done to test the capacity of the intersection to cater for additional traffic as a result ofbackground traffic growth or in the event of the development traffic being underestimated. From this analysis itwas found the intersection should be able to cope with 12% and 14% growth in traffic on Winter Saturdays andnormal weekdays respectively.From the analysis it is concluded that the proposed intersection layout should be adequate to service the forecasttraffic demand at acceptable LoS. It is also shown that the AM and PM traditional weekday peaks perform betterthat the Saturday netball peaks.T:\60218676 - Wembley PK TA\8 Issued Docs\8.1 Reports\Comprehensive Integrated Access RevF.docxRevision F - 8 February 2012
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