Chesterfield, Cross Avenue, Blackrock, Co. Dublin
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TRAFFIC ASSESSMENT AND MOBILITY REPORT CHESTERFIELD, CROSS AVENUE, BLACKROCK, CO. DUBLIN 1 Proposed Residential Development at Chesterfield, Cross Avenue, Blackrock, County Dublin Traffic Assessment and Mobility Report Barrett Mahony Consulting Engineers Dr Martin Rogers Transport Planning Professional October 2018 CONTENTS 1 NON-TECHNICAL SUMMARY ................................................................................. 4 2 SITE LOCATION, EXISTING ROAD NETWORK AND DETAILS OF TRAFFIC SURVEYS UNDERTAKEN ............................................................................................................... 5 3 TRIP GENERATION, DISTRIBUTION AND ASSIGNMENT ANALYSIS FOR PROPOSED DEVELOPMENT ............................................................................................................. 6 3.1 INTRODUCTION ....................................................................................................... 6 3.2 TRIPS GENERATED BY CANDIDATE SITE .......................................................................... 6 3.3 TRIP DISTRIBUTION .................................................................................................. 8 3.4 TRIP ASSIGNMENT ................................................................................................... 8 3.5 GENERAL COMMENT ON TRIP GENERATION FIGURES ....................................................... 9 4 TRAFFIC IMPACT ASSESSMENT OF PROPOSED DEVELOPMENT ON 2 NO. ADJACENT MAJOR JUNCTIONS ..................................................................................... 9 4.1 INTRODUCTION ....................................................................................................... 9 4.2 ANALYSIS OF BOOTERSTOWN AVENUE / CROSS AVENUE / SAN SOUCI PARK SIGNALISED JUNCTION .......................................................................................................................... 9 4.2.1 Geometric parameters ............................................................................... 9 4.2.2 Signal timings and phasing ....................................................................... 10 4.2.3 Analysis of existing AM and PM peak hour flows ..................................... 11 4.2.4 Analysis of 2021 and 2036 AM and PM peak hour flows without development in place (Do-nothing scenarios) .......................................................... 13 4.2.5 Analysis of 2021 and 2036 AM and PM peak hour flows with development in place (Do-something scenarios) ........................................................................... 17 4.3 ANALYSIS OF MOUNT MERRION AVENUE / CROSS AVENUE / WOODVIEW SIGNALISED JUNCTION ........................................................................................................................ 21 4.3.1 Geometric parameters ............................................................................. 21 4.3.2 Signal timings and phasing ....................................................................... 21 4.3.3 Analysis of existing AM and PM peak hour flows ..................................... 22 4.3.4 Analysis of 2021 and 2036 AM and PM peak hour flows without development in place (Do-nothing scenarios) .......................................................... 25 4.3.5 Analysis of 2021 and 2036 AM and PM peak hour flows with development in place (Do-something scenarios) ........................................................................... 29 4.4 COMMENT ON OVERALL EFFICIENCY OF LOCAL NETWORK AS ANALYSED............................. 33 5 COMPLIANCE WITH PARKING REQUIREMENTS OF DUN LAOGHAIRE RATHDOWN COUNTY COUNCIL ....................................................................................................... 34 6 MOBILITY PLAN - PUBLIC TRANSPORT, WALKING AND CYCLING FACILITIES SERVING THE PROPOSED DEVELOPMENT ................................................................... 36 6.1 INTRODUCTION ..................................................................................................... 36 6.2 DUBLIN BUS ......................................................................................................... 36 6.3 DART ................................................................................................................. 37 6.4 INTERURBAN RAIL .................................................................................................. 38 6.5 PEDESTRIAN AND CYCLE ROUTES SERVING THE PROPOSED DEVELOPMENT .......................... 38 6.5.1 Pedestrian facilities .................................................................................. 38 6.5.2 Cycle facilities ........................................................................................... 39 7 OVERALL CONCLUSIONS REGARDING SUSTAINABILITY OF PROPOSED RESIDENTIAL DEVELOPMENT IN TRANSPORTATION TERMS ....................................... 39 2 FIGURES Figure 1: Site plan indicating the proposed development entrance onto Cross Avenue Figure 2: Location of site relative to 2 No. major junctions in its vicinity Figure 4: Existing flows at Booterstown Avenue and Mount Merrion Avenue junctions - PA peak Figure 4: Existing flows at Booterstown Avenue and Mount Merrion Avenue junctions - PM peak Figure 5: Development flows incident on Booterstown Avenue and Mount Merrion Avenue junctions - AM peak Figure 6: Development flows incident on Booterstown Avenue and Mount Merrion Avenue junctions - PM peak Figure 7: Core Bus routes map and enlarged image showing 7 and 46a routes Figure 8: Diagrammatic representation of DART line Figure 9: Access from subject site to Blackrock DART Station Figure 10: Intercity rail network serving Dublin Figure 11: Existing cycle facilities in vicinity of candidate site Figure 12: New cycle facilities proposed in vicinity of candidate site under GDA Cycle Network APPENDIX 1 Details of trip generation analysis for apartment and housing development types 3 1 NON-TECHNICAL SUMMARY Cairn Homes Properties Limited is seeking permission for the development of a 3.4-hectare site at Chesterfield, Cross Avenue, Blackrock, Co. Dublin. The proposed development consists of 221 No. new homes, of which 7 No. are houses and 214 No. are apartments. Amenity facilities including a crèche, gym, meeting room and cinema room are also proposed, accessed from the landscaped podium. The proposed development thus consists of the following development types: • 214 No. apartments • 7 No. houses To the south, the proposal incorporates 211No. apartments contained within 7No. buildings. Parking for these apartments will largely be located at basement level which accommodates 302 no. car parking spaces. To the north,14 No. spaces are located at grade to the front of the proposed 7 No. houses. Chesterfield House will accommodate 3no. apartments. for which 6no. resident parking spaces are provided on the south side of the road leading into the square. 3no. drop-off spaces for the crèche are proposed at surface level, along with a further 3no. crèche staff spaces at basement level. The total car parking provision is therefore 325no. spaces. Bicycle parking is compliant with DLRCC standards and includes 274 no. spaces for both short and long stay located primarily within the basement. This report contains a traffic assessment and mobility plan for the proposed development. A site plan of the proposal is contained within Figure 1. The traffic assessment will assess the existing, day-of-opening and design year (year-of-opening plus 15) flows at the following two junctions in the vicinity of the proposed development. This is completed in order to assess the impact of the proposed development on the efficient working of these junctions: 1. Cross Avenue / Booterstown Avenue / San Souci Park (signalised junction) 2. Cross Avenue / Mount Merrion Avenue / Woodview (signalised junction) Section 2 provides details of the site location and the existing local road network. 4 Section 3 details the traffic predicted to be generated by the proposed development. Section 4 provides the traffic analysis of the 2 No. junctions under scrutiny. Section 5 demonstrates the compliance of the proposed development with the parking requirements of Dun Laoghaire Rathdown County Council. Section 6 details the public transport and soft mode access that would be available to residents and visitors at the proposed development. Section 7 makes some concluding comments regarding the sustainability of the proposed project in transportation terms. 2 SITE LOCATION, EXISTING ROAD NETWORK AND DETAILS OF TRAFFIC SURVEYS UNDERTAKEN The site is located south of Cross Avenue, approximately 500 metres west of its junction with Mount Merrion Avenue and approximately 250 metres east of its junction with Booterstown Avenue. The location of the site relative to these two junctions is detailed within Figure 2. Given that the proposed development is primarily residential, peak flows will typically occur on weekdays, with peak flows typically occurring between 7am and 9am in the morning and between 4pm and 6pm in the evening. Accordingly, a traffic survey was carried out on Thursday 14th September 2017 at the 2 No. critical junctions. The survey was carried out over a 12-hour period between 0700 and 1900 in order to ascertain the peak hour flows for all traffic movements at the 2 No. junctions. The surveys indicated that the weekday morning peak occurred between 0800 and 0900 with the evening peak occurring between 1600 and 1700 – these were observed to be the timeframes during which the junctions were most heavily loaded. The