Appendix X Technical Note 4: Base Junction Models
States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
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Job number 237035
Ove Arup & Partners Ltd 4 Pierhead Street Capital Waterside Cardiff CF10 4QP United Kingdom www.arup.com
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
Contents
Page
1 Introduction 1 1.1 Background 1 1.2 Note Structure 3
2 LinSig Assessments 4 2.1 Junction 1/8/12/3: The A1 Esplanade with Gloucester Street/Patriotic Street/Kensington Place/Peirson Road/St Aubin’s Road 4 2.2 Junction 4: Elizabeth Place/Rouge Bouillon/ Savile Street 7 2.3 Junction 5: The Parade/Union Street junction 8 2.4 Junction 13: Gloucester Street/Seaton Place Pedestrian Crossing 10
3 ARACDY Assessment 12 3.1 Junction 6: St Aubin’s Road/A1 Roundabout 12
4 PICADY Assessments 13 4.1 Junction 7: St Aubin’s Road/Kensington Street/ Peirson Road 13 4.2 Junction 10: St Aubin’s Road/Westmount Road 15 4.3 Junction 11: St Johns Road/Old St Johns Road/West Park Avenue/Cheapside 16 4.4 Junction 14: Gloucester Street / Newgate Street 18
5 Baseline Junction Modelling Summary 20
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
1 Introduction
1.1 Background Ove Arup & Partners Ltd (Arup) is preparing a Transport Assessment on behalf of Jersey Future Hospital in support of a planning application for the development of a new hospital and associated works in St Helier, Jersey. The development site includes land partially occupied by the existing Jersey General Hospital. Following discussions with the Department for Infrastructure (DfI) Transport Policy it has been agreed that a series of technical notes would be submitted for comment prior to the submission of the outline planning application, providing opportunity for a number of the technical matters to be resolved. The proposed technical notes will consider the following topics: Technical Note 1: Background Traffic Growth; Technical Note 2: Trip Distribution; Technical Note 3: Base Transport Study; Technical Note 4: Base Junction Models; Technical Note 5: Trip Generation; and Technical Note 6: Mitigation Proposals. This Technical Note, Base Junction Models (TN4) details the methodology and results of the junction assessments undertaken in the base year 2016. Junction assessments have been undertaken for 14 junctions over 12 models, using LinSig for signalised junctions, ARCADY for roundabouts, and PICADY software for priority junctions. Junction models and output files have also been made available to DfI Transport Policy. To obtain traffic flow data, classified traffic turning count surveys were all undertaken on 19th October 2016 aside from the following: Esplanade/Kensington Place priority junction was surveyed on 30th November 2016; Gloucester Street/Seaton Place/Patriotic Street Signalised Junction was surveyed on 7th February 2017. Signal specification sheets were provided by the Department for Infrastructure for each of the signalised junctions and used to directly inform the staging and phasing within the LinSig models. The junctions that have been tested within this note have been previously agreed with DfI Transport Policy, are detailed in Table 1 and illustrated in Figure 1.
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
Table 1: Summary of junctions to be assessed
Ref: Junction Junction Model 1 Gloucester Street/Esplanade signalised junction LinSig 2 Elizabeth Place/The Parade/Elizabeth Place/Cheapside No model required 3 Peirson Road/Victoria Avenue/Esplanade/A1 St Aubin’s Road LinSig 4 Rouge Bouillon/Savile Street/Elizabeth Place/Parade Road LinSig signalised junction 5 Union Street/The Parade signalised junction LinSig 6 St Aubin’s Road/A1 Roundabout ARCADY 7 St Aubin’s Road/Kensington Street/Peirson Road junction PICADY 8 The Esplanade/Patriotic Street No model required 9 The Parade/Gloucester Street No model required 10 St Aubin’s Road/Westmount Road priority junction PICADY 11 St. John's Road/West Park Avenue/Cheapside/ Old Saint John's PICADY Road staggered priority junction 12 Esplanade/Kensington Place; LinSig 13 Gloucester Street/Seaton Place/Patriotic Place signalised junction LinSig 14 Newgate Street/Gloucester Street priority junction PICADY
Figure 1: Junction locations and type
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
1.2 Note Structure The remainder of the Technical Note will be structured as follows: Section 2 sets out the signalised junctions that have been assessed using the software programme LinSig; Section 3 includes the assessment of the roundabout located within the study area using the software programme ARCADY; Section 4 provides an assessment of the priority junctions using the software programme PICADY; and Section 5 provides a summary of the results.
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
2 LinSig Assessments
2.1 Junction 1/8/12/3: The A1 Esplanade with Gloucester Street/Patriotic Street/Kensington Place/Peirson Road/St Aubin’s Road All four junctions have been modelled together in a LinSig network model. The Kensington Place junction has recently been improved with a right-turn signal from the Esplanade onto Kensington Place. This improvement has been incorporated into the model however it should be noted that the junction count was undertaken prior to the installation of the right-turn signal. The stages used for this section of the junction were amended from the Esplanade/Kensington Place Signal Plan to replicate on site observations. This meant that eastbound traffic and the westbound pedestrian crossing were run in stage 1 and all other phases were run in Stage 2. An overall cycle time of 120 seconds was used for the AM model, and 90 seconds for the PM model. The results of the baseline situation are include in Table 2.
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
G
1 64.7% Arm J4:5 - St Aulbin's Rd 65.9%
Inf Arm J4:2 - St Aubin's Rd
420 451
F 76.5% 76.5% Inf 59.1% Arm J4:4 - Esplanade E
2 1940 2080 1 Inf Arm J4:1 - Vicotria Ave771 0.0% Inf 759 1 1227
1 2 Inf
1905 Inf 2045 Inf 2045 Inf
1 2 3 0.0% Arm J4:3 - Peirson Rd 0.0% 0.0% J4: Esplanade/Victoria Ave/St Aubins Rd/Peirson Rd PRC: 17.5 % Total Traffic Delay: 26.2 pcuHr Controller: 3
Arm J4:6 - Esplanade
35.6% 51.5% 4 51.8% 3 2 D 1925 1 2065 1504 2065 Arm J3:2 - Esplanade1612 1 1925 1612 Inf 34 625 1940 1721 2080 1604 2080 Inf 76.6% 76.6% 1 J2: Esplanade/Patriotic Street 33.2% 2 PRC: 153.0 % 33.4% 3 0.0% Total Traffic Delay: 0.8 pcuHr Arm J3:3 - Kensington Pl
C
31.5% 35.6% 1 33.5% 1940 Inf 4 2080 3 2080 2 1940 Arm J2:2 - 1940 1 2080 2080 Inf 2080 2080 J3: Esplanade/Kensington Pl 1940 Arm J3:1 - Esplanade PRC: 30.8 % 1 Total Traffic Delay: 8.0 pcuHr 2 0.0% Controller: 2 3 Arm J2:1 - Patriotic Street
B 259 66.3% 260 68.6% 1612 68.6% 1504 921 Arm J1:2 - Esplanade 988 36.0% 988 Arm J1:4 - Gloucester St 36.0% 1940 75.1% 2080 658 2080 658 658 1 68.8% 2 1925 68.8% 3 1925 51.0% 3 40.6% 1925 2 1
Arm 0.0%J1:1 - Esplanade 0.0% 0.0%
3 Inf Arm J1:3 - Esplanade 2 Inf 1 2080 Inf 2080 Inf 1940 Inf 1161 Inf 1 1161 1083 2 37.5% 3 39.1% 39.4% A
J1: Esplanade/Gloucester St PRC: 19.8 % Total Traffic Delay: 29.1 pcuHr Controller: 1 Figure 2: Junction 1/8/12/3 LinSig Diagram – Base 2016
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
Table 2: Junction 1/8/12/3 LinSig Results – Base 2016
AM PM Mean Mean Average Deg Average Link Lane Deg Sat Max Max Surveyed Sat Surveyed (%) Queue Queue Queue (%) Queue (pcu) (pcu) Network PRC 17.5% @120 seconds 31.2% @90 seconds J1: Esplanade/Gloucester Street 75.1% 68.6% 1/1 Esplanade WB Ahead L 39.4% 8.3 4.1 60.7% 12.5 6.0 1/2 Esplanade WB Ahead A 39.1% 8.8 5.1 67.2% 13.7 7.3 1/3 Esplanade WB Ahead R 37.5% 8.4 5.8 63.4% 13.5 6.3 2/1 Esplanade EB Ahead L 66.3% 12.5 7.3 35.9% 5.0 4.7 2/2 Esplanade EB Ahead A 68.6% 13.8 6.7 49.0% 5.6 4.0 2/3 Esplanade EB Ahead R 68.6% 12.8 3.3 60.4% 5.6 2.6 4/1 Gloucester St Left 75.1% 16.0 8.4 68.6% 11.9 8.3 4/2 Gloucester St Right 36.0% 6.2 3.6 45.2% 6.7 4.8 4/3 Gloucester St Right R 36.0% 6.2 6.3 47.9% 7.2 7.2 J1: PRC 19.8% @120 seconds 31.2% @90 seconds J8: Esplanade/Patriotic Street 35.6% 21.4% 2/1 Esplanade EB Ahead Left 31.5% 0.2 - 15.3% 0.1 - 2/2 Esplanade EB Ahead 35.6% 0.3 - 21.4% 0.1 - 2/3 Esplanade EB Ahead 33.5% 0.3 - 21.0% 0.1 - J8: PRC 153.0% @120 seconds 320.7% @90 seconds J12: Esplanade/Kensington Place 68.8% 62.4% 1/1 Esplanade WB Ahead LL 40.6% 8.6 2.5 54.6% 6.0 2.5 1/2 Esplanade WB Ahead L 51.0% 11.0 3.5 56.1% 4.7 3.6 Esplanade WB Right : 57.2 : 1/3+4 68.8% 7.0 9.0 22.2 3.7 Ahead R 62.4% 2/1 Esplanade EB Left Ahead 35.6% 2.5 7.3 18.8% 0.9 1.9 2/2 Esplanade EB Ahead 51.5% 4.0 4.5 31.2% 3.3 1.2 2/3 Esplanade EB Ahead R 51.8% 3.0 2.7 30.4% 2.8 0.5 J12: PRC 30.8% @120 seconds 44.2% @90 seconds J3: Esplanade/St Aubin’s Road 76.6% 68.6% 1/1 Victoria Ave EB Ahead L 67.5% 12.9 17.2 66.4% 7.8 11.2 1/2 Victoria Ave EB Ahead 55.5% 15.6 14.2 47.1% 6.5 7.8 1/3 Victoria Ave EB Ahead 52.7% 9.1 9.0 19.6% 4.7 5.9 2/1 St Aubin's Rd Ahead Left 46.5% 9.9 3.8 43.6% 4.7 3.6 2/2 St Aubin's Rd Ahead 56.1% 9.7 4.1 68.1% 7.8 3.5 6/1 Esplanade WB Ahead 33.4% 0.3 0.7 55.2% 8.2 0.8 6/2 Esplanade WB Ahead 33.2% 0.3 1.3 56.7% 0.8 1.7 6/3+4 Esplanade WB R: Ahead 76.6% 17.7 8.4+1.5 68.6% 6.5 8.7+2.2 J3: PRC 17.5% @120 seconds 31.3% @90 seconds
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
The analysis indicates that in the AM and PM peaks, all three signalised junctions operate below their theoretical capacity. The Practical Reserve Capacity (PRC) for the network is 17.5% for the AM peak, and 31.2% for the PM peak scenario. The link with the highest degree of saturation is Gloucester Street in the AM peak and Esplanade (westbound) in the PM peak, at 75.1% and 68.6% respectively.
2.2 Junction 4: Elizabeth Place/Rouge Bouillon/ Savile Street Junction 4 operates with a cycle time of 90 seconds in the AM peak and PM peak, with a double-cycle for stages operating the mainline flow (Rouge Bouillon and Elizabeth Place) and the pedestrian phase, with the side roads (Savile Street and Parade Road) running every other cycle.
Parade Rd/Elizabeth Pl/Saville St/Rouge Bouillon
D
Arm 1 - Parade Road
1 A
1 Arm 2 - Rouge Bouillon Arm 5 -
1 1
Arm 3 - Saville Street 2 Arm 6 - 1 Arm 4 - Elizabeth Place
C 1
B
Figure 3: Junction 4 LinSig Diagram – Base 2016 Queues observed on these arms were generally longer than the initial results in the model. It is considered that drivers are more hesitant to join the traffic in reality which is why the observed queues are slightly longer than the modelled queues. The model was then calibrated using the observed queue data, shown in Table 3 for comparison. Adjustments made to the model junction included reducing the saturation flow on Savile Street to 1700 PCU/hr and Parade Road to 1750PCU/hr
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
to simulate a more hesitant driving behaviour, and calibrating the green time on each arm to produce queuing in line with observed data. Results of the baseline situation is shown in Table 3. Table 3: Junction 4 LinSig Results – Base 2016
Link Lane AM PM Deg Sat Mean Surveyed Deg Sat Mean Surveyed (%) Max Queue (%) Max Queue Queue Queue (pcu) (pcu) Network PRC 4.1% @90 seconds 0.5% @90 seconds 1/1 Parade Road Left 86.5% 7.2 9.3 75.9% 4.3 7.3 Right 2/1 Rouge Bouillon 84.2% 7.7 9.0 73.2% 6.4 5.1 Ahead 3/1 Savile Street Left 25.3% 1.2 2.0 30.9% 1.8 3.0 3/2 Savile Street Right 78.4% 5.2 5.4 89.6% 8.8 9.4 4/1 Elizabeth Place 74.9% 5.8 4.2 81.8% 7.7 5.6 Ahead
The analysis indicates that with the queuing as close to observed as possible, that the junction operates near to its theoretical capacity in the AM peak. The highest degree of saturation was found to be on Parade Road at 87% in the AM peak, and Savile Street at 90% for right turning traffic in the PM peak. Whilst observed and modelled queue lengths at this junction are considered to be acceptable, the PRC and Degree of Saturation suggests this junction is operating over capacity. The operation of this junction will therefore be monitored in the future year scenarios. However it should be noted that the potential for mitigation at this junction is considered to be limited due to the constrained siting of the junction. Whilst there could be potential to finesse signal timings, more significant capacity improvements may impact pedestrian amenity and therefore not be considered acceptable.
2.3 Junction 5: The Parade/Union Street junction The junction is operating on a 70 second cycle time, with a double-cycle for the pedestrian phase and traffic phases alternating after the pedestrian phase.
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models The Parade/Union Street
A
1
Arm 1 - The Parade N
Arm 5 -
1
1
Arm 4 - Arm 2 - Union Street B 1
1 2
Arm3 - The Parade S
C
Figure 4: Junction 5 LinSig Diagram – Base 2016 Junction 5 was calibrated using observed queue data, shown in Table 4. Adjustments made to the model junction included reducing the saturation flow on The Parade to simulate a more hesitant driving behaviour, and calibrating the green time on each arm to produce queuing in line with observed data. Results of the baseline situation are shown in Table 4. Table 4: Junction 5 LinSig Results – Base 2016
Link Lane AM PM Deg Sat Mean Surveyed Deg Sat Mean Surveyed (%) Max Queue (%) Max Queue Queue Queue (pcu) (pcu) Network PRC -9.6% @70 seconds -7.5% @70 seconds 1/1 The Parade N Left 78.5% 6.6 6.1 65.6% 5.4 6.8 2/1 Union Street Right 98.6% 15.1 15.3 96.7% 14.8 14.0 3/1 The Parade S Ahead 33.8% 2.9 3.4 48.2% 4.1 3.6 3/2 The Parade S Right 73.1% 7.9 7.4 79.1% 8.4 6.9
Following the calibration of observed queue lengths, the results show that Union Street is nearing theoretical capacity at both the AM and PM peaks. It is therefore proposed to monitor the operation of this junction in the future year scenarios. However due to the constrained nature of this junction, capacity improvements may be limited to minor alterations to signal timings.
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
2.4 Junction 13: Gloucester Street/Seaton Place Pedestrian Crossing The junction runs with a cycle time of 75 seconds in the AM peak, and 60 seconds in the PM peak, as per the signal specification. Seaton Place operates on give way control. Traffic from Seaton Place (Arm 4) was routed to the middle lane of Gloucester Street (Arm 5) south bound, since it is unlikely that these vehicles would not turn left at Esplanade (which is downstream from this junction) as they would have made this turn before reaching this junction. Traffic from Gloucester Road south bound (Arm 2) which would be turning left at Esplanade, was routed into the left most lane at the traffic signals, which is in line with current road markings.
Figure 5: Junction 13 LinSig Diagram – Base 2016 Junction 13 was calibrated using existing queue data, shown in Table 5.
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
Table 5: Junction 13 LinSig Results – Base 2016
AM PM Mean Mean Link Lane Deg Sat Max Surveyed Deg Sat Max Surveyed (%) Queue Queue (%) Queue Queue (pcu) (pcu) Network PRC 53.4% @75 seconds 34.7% @75 seconds Gloucester 2/1 Street Left 58.7% 9.4 8.4 66.8% 9.4 7.3 Ahead Gloucester 2/2 21.6% 2.4 1.7 23.9% 2.3 1.6 Street Ahead Gloucester 2/3 Street Right 28.6% 3.3 3.3 35.7% 3.8 4.5 Ahead Seaton Place 3/1 24.2% 2.1 3.8 24.2% 1.8 4.2 Ahead Left
The assessment found that the junction is operating below theoretical capacity, with a PRC for the junction of 53% in the AM peak, and 35% in the PM peak.
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
3 ARACDY Assessment
3.1 Junction 6: St Aubin’s Road/A1 Roundabout The junction has been modelled as a standard roundabout in ARCADY.
Figure 6: Junction 6 ARCADY Diagram – Base 2016 (AM only) The results of the baseline situation are shown in Table 6. Table 6: Junction 6 ARCADY Results – Base 2016
Arm AM PM Survey Queue Delay RFC Survey Queue Delay RFC Queue (PCU) (s) Queue (PCU) (s)
1 A1 North 6.1 6.7 29.66 0.88 6.7 6.6 34.25 0.88
St Aubin’s 2 1.1 1.0 31.08 0.52 1.3 4.0 55.68 0.82 Road
3 A1 South 2.0 1.7 11.97 0.64 3.0 2.5 12.64 0.72
The roundabout is operating close to capacity, with the highest Ratio of Flow to Capacity (RFC) value on the A1 South arm of 0.88 in the AM peak. Queuing shown by the model is low at around seven vehicles maximum during the PM peak. Calibration of the model was undertaken using data from the queue length survey. It is noted that this junction is approaching capacity and will therefore be assessed in future year scenarios, subject to the results of the percentage impact assessment. It is considered that there should be potential for a mitigation scheme at this junction, potentially involving signals.
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
4 PICADY Assessments
4.1 Junction 7: St Aubin’s Road/Kensington Street/ Peirson Road The analysis of this junction was undertaken in two parts due to the complexity of the streams of traffic through the junction. Junction 7a evaluates the Peirson Road junction with the spur from Kensington Street. This junction has give way lines on both entries and therefore neither entry has priority. Given it is not possible to model this bespoke arrangement within PICADY, the model has been created so traffic on the spur from Kensington Street gives way to vehicles on Peirson Road. Junction 7b assesses the St Aubin’s Road/ Kensington Street priority junction.
Figure 7: Junction 7a PICADY Diagram – Base 2016 (Flows shown are AM only)
Figure 8: Junction 7b PICADY Diagram – Base 2016 (Flows shown are AM only)
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
The results of the baseline situation are shown in Table 7 and Table 8. Table 7: Junction 7a PICADY Results – Base 2016
Arm AM PM Survey Queue Delay RFC Survey Queue Delay RFC Queue (PCU) (s) Queue (PCU) (s) A Peirson Road ------North (exit only) B Spur from 1.4 0.3 9.5 0.22 2.3 1.0 15.6 0.51 Kensington Street C Peirson Road ------South
Table 8: Junction 7b PICADY Results – Base 2016
Arm AM PM Survey Queue Delay RFC Survey Queue Delay RFC Queue (PCU) (s) Queue (PCU) (s) A St Aubin’s ------Road East B Kensington 4.1 0.9 16.8 0.49 4.3 3.5 43.3 0.79 Street C St Aubin’s ------Road West
The results show that both junctions are operating below capacity and with little queuing. The model has been calibrated using the available parameters within Junctions 9 however these are limited. It should be noted that works are proposed at this junction in order to accommodate the largest vehicles associated with the demolition and construction phase of Jersey Future Hospital.
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
4.2 Junction 10: St Aubin’s Road/Westmount Road The analysis of this junction was undertaken using the software programme PICADY. The results of the junction assessment are presented in Table 9.
Figure 9: Junction 10 PICADY Diagram – Base 2016 (Flows shown are AM only)
Table 9: Junction 10 PICADY Results – Base 2016
Arm AM PM Survey Queue Delay RFC Survey Queue Delay RFC Queue (PCU) (s) Queue (PCU) (s) A St Aubin’s ------Road West B Westmount 2.5 0.7 11.0 0.4 1.0 0.2 8.6 0.18 Road C St Aubin’s ------Road East
The results in Table 9 show that the junction is operating well below capacity, with little to no queuing. The pedestrian crossing on Arm C has not been modelled because within PICADY software (Junctions 9) the major arm cannot block traffic with a pedestrian crossing at the junction. The absence of the pedestrian crossing and associated data should not impact the junction model results significantly. Calibrating the model was difficult due to limited scope for changing junction parameters within the Junctions 9 software, however, observed queue lengths are also relatively small for both AM and PM peaks. It is noted that queuing does occur on St Aubin’s Road in the peak hours, however it is not possible for the junction model to replicate these conditions.
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
4.3 Junction 11: St Johns Road/Old St Johns Road/West Park Avenue/Cheapside The analysis of this junction was undertaken in two parts due to the complexity of the streams of traffic through the junction. Junction 11a evaluates the Cheapside/St Johns Road/Old St Johns Road priority junction, and Junction 11b assesses the Cheapside priority junction with the link from St John’s Road and West Park Avenue.
Figure 10: Junction 11a PICADY Diagram – Base 2016 (Flows shown are AM only) The results in Table 10 show that in the AM peak, St Johns Road is nearing theoretical capacity, with an RFC of 0.94.
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
Table 10: Junction 11a PICADY Results – Base 2016 Arm AM PM Survey Queue Delay RFC Survey Queue Delay RFC Queue (PCU) (s) Queue (PCU) (s) A Cheapside ------(entry only) B St John’s Road 6.3 9.7 79.1 0.94 3.3 1.7 20.1 0.63
C W Park Avenue ------(exit only) D Old Saint ------John’s Rd (exit only)
Calibrating the model was difficult due to limited scope for changing junction parameters within the Junctions 9 software, however, model queuing was calibrated where possible. Guidance for the assessment of priority junctions states that visibility should be measured 10m back from the stop line, however due to the poor visibility from Arm B, it was more realistic to consider this parameter closer to the stop line, where visibility is improved to (220m) and no obstructions are in drivers line of sight. It is noted that capacity problems are forecast on the St John’s Entry to this junction. As a result, it is proposed to monitor the operation of this junction in future year scenarios subject to the results of the percentage impact assessment.
Figure 11: Junction 11b PICADY Diagram – Base 2016 (Flows shown are AM only)
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
Overall, the results in Table 11 below show that this part of Junction 11 is operating within capacity, with little queuing and minimal delay. Table 11: Junction 11b PICADY Results – Base 2016
Arm AM PM Survey Queue Delay RFC Survey Queue Delay RFC Queue (PCU) (s) Queue (PCU) (s) A Cheapside ------(entry only) B Link - 2.6 21.5 0.73 - 0.8 10.7 0.46 (entry only) C Cheapside ------(exit only)
4.4 Junction 14: Gloucester Street / Newgate Street The analysis of this junction was undertaken using the software programme PICADY. The results of the junction assessment are presented in Table 12.
Figure 12: Junction 14 PICADY Diagram – Base 2016 (Flows shown are AM only) Table 12: Junction 14 PICADY Results – Base 2016
Arm AM PM Survey Queue Delay RFC Survey Queue Delay RFC Queue (PCU) (s) Queue (PCU) (s) A Gloucester ------Street West (exit only) B Newgate Street - 0.7 16.6 0.40 - 1.7 27.0 0.64 (entry only) C Gloucester ------Street East (entry only)
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
The results in Table 12 show that the junction is operating within capacity, with little queuing and minimal delay.
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States of Jersey Jersey Future Hospital Technical Note 4: Base Junction Models
5 Baseline Junction Modelling Summary
A summary of the results from the junction modelling is shown in Table 13. The maximum link ratio of flow to capacity (RFC) for priority junctions and roundabouts is provided, and the junction Practical Reserve Capacity (PRC) for signalised junctions is shown. Numbers in green indicate which junctions are under capacity, orange is for those approaching capacity, and red is for those over capacity. Table 13: Summary of Junction Assessment Results (PRC or Highest Link RFC)
Junction Name Model AM Peak PM Peak Esplanade/Gloucester Street/Patriotic 1-8-12-3 Street/Kensington Place/Peirson LinSig 17.5% 31.2% Road Network
1 Esplanade/Gloucester Street LinSig 19.8% 31.2%
12 Esplanade/Kensington Place LinSig 30.8% 44.2%
Esplanade/Victoria Ave/St Aubin’s 3 Road/Peirson Road LinSig 17.5% 31.3%
4 Rouge Bouillon / Savile Street LinSig 4.1% 0.5%
5 Union Street / The Parade LinSig -9.6% -7.5%
6 St Aubin’s Road / A1 Roundabout ARCADY 0.88 0.88
Peirson Road / spur from Kensington 7a Street PICADY 0.22 0.51
7b St Aubin’s Road / Kensington Street PICADY 0.49 0.79
10 St Aubin’s Road / Westmount Road PICADY 0.40 0.18
Cheapside / St. John's Road / West 11a Park Avenue / Old Saint John's Road PICADY 0.94 0.63 Spur from St. John's Road and West 11b Park Avenue / Cheapside PICADY 0.73 0.46 Gloucester Street / Seaton Place / 13 Patriotic Place LinSig 53.4% 34.7%
14 Newgate Street / Gloucester Street PICADY 0.40 0.64
Overall, the junctions are found to be operating below their theoretical capacity. However Rouge Bouillon/Savile Street and the Union Street/The Parade signalised junctions are operating above the practical reserved capacity. Furthermore, the priority junction at Peirson Road/St Johns Road/Cheapside (Junction 11) is approaching its theoretical capacity. Whilst the operation of these junctions will be monitored in the future year scenarios, it should be noted that the
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potential for mitigation works is limited due to the constrained locations in which the junctions are sited.
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