Elmwood Preserve
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TRAFFIC STUDY ELMWOOD PRESERVE 850 DOBBS FERRY ROAD TOWN OF GREENBURGH, NEW YORK Prepared for: Ridgewood Elmwood Owner LLC 850 Dobbs Ferry Road Greenburgh, NY 10607 Prepared by: JMC Project 17099 Date: April 5, 2018 Revised: April 20, 2018 TABLE OF CONTENTS SECTION DESCRIPTION PAGE I. INTRODUCTION ..........................................................................................................1 II. EXISTING CONDITIONS ...........................................................................................2 A. Existing Roadway Network ...................................................................................2 B. Existing Volumes ......................................................................................................5 C. Intersection Analysis Methodology ......................................................................5 D. Existing Operations .................................................................................................9 III. PROJECTED CONDITIONS .................................................................................... 10 A. No-Build Volumes ................................................................................................. 10 B. Build Volumes ........................................................................................................ 11 IV. TOWN PARK EXPANSION .................................................................................... 12 V. FINDINGS & CONCLUSION .................................................................................. 13 LIST OF APPENDICES APPENDIX DESCRIPTION A. TABLES TABLE TITLE 1 Proposed Development Volumes 2 Potential Town Park Expansion Volumes ARC-1 As-Of-Right Development Volume Comparison 3 Intersection Operations-Peak Weekday AM Hour 4 Intersection Operations-Peak Weekday PM Hour B. FIGURES FIGURE TITLE 1 2017 Existing Volumes-Peak Weekday AM Hour 2 2017 Existing Volumes-Peak Weekday PM Hour 3 2022 General Growth Volumes-Peak Weekday AM Hour i 4 2022 General Growth Volumes-Peak Weekday PM Hour 5 Other Development Volumes-Frank’s Nursery Redevelopment 6 Reoccupied Volumes-Peak Weekday AM Hour 7 Reoccupied Volumes-Peak Weekday PM Hour 8 2022 No Build Volumes-Peak Weekday AM Hour 9 2022 No Build Volumes-Peak Weekday PM Hour 10 Primary Trip Distributions 11 Primary Volumes-Peak Weekday AM Hour 12 Primary Volumes-Peak Weekday PM Hour 13 2022 Build Volumes-Peak Weekday AM Hour 14 2022 Build Volumes-Peak Weekday PM Hour 15 Town Park Expansion Distributions 16 Town Park Expansion Volumes-Peak Weekday AM Hour 17 Town Park Expansion Volumes-Peak Weekday PM Hour 18 2022 Build Volumes with Town Park Expansion-Peak Weekday AM Hour 19 2022 Build Volumes with Town Park Expansion-Peak Weekday PM Hour C. TURNING MOVEMENT COUNTS D. CAPACITY ANALYSES P:\2017\17099\ADMIN\Traffic\TS_2018-04-20.docx ii I. INTRODUCTION This Traffic Study has been prepared to assess existing conditions as well as future traffic operations in association with the proposed redevelopment located at 850 Dobbs Ferry Road in the Town of Greenburgh, NY. The location of the site is illustrated on the figures included in Appendix B. The 116.3 acre site was formerly a golf course known as Elmwood Country Club which contained a clubhouse, tennis courts and a pool. The Elmwood Country Club has been closed since September 30, 2017. The applicant proposes to construct an age-restricted housing community. There are 44 proposed buildings containing 175 townhouses for seniors (age 55 and older). The applicant proposes amenities such as a clubhouse, tennis courts and a pool. The existing property provides a single driveway, located adjacent to the NY 100B and Worthington Road intersection, with entry and exit lanes separated by a landscaped area. As part of the redevelopment, the existing entry and exit lanes are proposed to be relocated to a new single driveway opposite Westchester View Lane. The development proposes a new main driveway intersecting with NY 100B opposite the former Frank’s Nursery driveway. Based on this study, the proposed age-restricted housing community development represents a reduction of traffic volumes compared to an as-of-right 119 single-family homes permitted on the property. The proposed age-restricted housing development is projected to generate similar traffic volumes as the reoccupancy of the existing golf course. The studied intersections under future conditions with the proposed age-restricted housing community are projected to operate at the same levels of service as projected for future conditions with re-occupancy of the golf course (without the proposed redevelopment). 1 II. EXISTING CONDITIONS A. Existing Roadway Network JMC performed field reconnaissance at the site and adjoining roadway network in order to gather existing conditions data. The field work included a determination of lane widths, striping, horizontal and vertical alignments, signs, speed limits, pedestrian activities, traffic flows, on street parking, sidewalks, curbing, etc. NY 100B (Dobbs Ferry Road) is an east/west highway which is under the jurisdiction of the New York State Department of Transportation (NYSDOT). NY 100B connects to NY 9A (Saw Mill River Road) in the west and NY 119 (Tarrytown Road) in the east. Within the study area, NY 100B generally provides one travel lane in each direction and widens in the vicinity of the Sprain Brook Parkway to provide additional lanes. It has a posted speed limit of 30 mph and on-street parking is generally not permitted within the study area. Sprain Brook Parkway is a north/south parkway which connects to the Taconic State Parkway in the north and the Bronx River Parkway in the south. The parkway is under the jurisdiction of the NYSDOT and provides three travel lanes in each direction. The parkway has a posted speed limit of 55 mph. NY 9A (Saw Mill River Road) is a north/south highway which is under the jurisdiction of the NYSDOT. It provides one travel lane in each direction and widens at a few intersections to provide additional lanes. The roadway has a posted speed limit of 45 mph and parking is generally prohibited on both sides of the street. 2 In order to evaluate the changes in traffic associated with the proposed redevelopment, the following intersections have been analyzed: 1. NY 100B & NY 9A 2. NY 100B & Worthington Road 3. NY 100B & Site Driveway A 4. NY 100B & Westchester View Lane with Site Driveway B 5. NY 100B & Site Driveway C 6. NY 100B & Sprain Brook Parkway Southbound On-Ramp with Town Park Driveway 7. NY 100B & Sprain Brook Parkway Southbound Off-Ramp 8. NY 100B & Sprain Brook Parkway Northbound Ramps The intersection of NY 9A and NY 100B is a three-legged signalized intersection. NY 9A provides a 12 foot wide thru lane and a 12 foot wide, 205 foot long separate right turn lane. NY 9A southbound provides a 12 foot wide thru lane with shared left turns. NY 100B provides a 12 foot wide lane with shared left and right turns onto NY 9A. At the intersection of NY 100B and Worthington Road, NY 100B provides an 11 foot wide travel lane in each direction with shared turning movements. Worthington Road provides an 11 foot wide travel lane with shared left and right turning movements onto NY 100B. The intersection is an unsignalized ‘T’-type intersection and the Worthington Road approach is controlled by a stop sign. Site Driveway A intersects NY 100B at an unsignalized intersection. NY 100B provides an 11 foot wide travel lane in each direction with shared turning movements. Site Driveway A provides access to the existing golf course and course. Site Driveway A is divided by a landscaped median to provide separate egress and ingress lanes. Site Driveway A provides a 15 foot wide egress lane with shared turning movements onto NY 100B. Under proposed conditions, Site Driveway A will be closed and access will be relocated to proposed Site Driveway B. 3 Site Driveway B is proposed to intersect NY 100B and constructed to align opposite Westchester View Lane. Site Driveway B proposes to provide access to the proposed clubhouse, amenities, and residences of the age-restricted housing community. NY 100B provides an 11 foot wide travel lane with shared turning movements in both directions. Westchester View Lane provides a 14 foot wide approach lane with shared turning movements which is controlled by a stop sign. Site Driveway B proposes a 12 foot wide approach lane with shared turning movements. Site Driveway B is proposed to be controlled by a stop sign. Site Driveway C is proposed to be constructed as part of the proposed redevelopment and to align opposite the driveway for the vacant Frank’s Nursery property. Site Driveway C proposes to provide access to the residences of the age-restricted housing community. NY 100B provides an 11 foot wide eastbound travel lane with shared turning movements. NY 100B westbound provides a separate 10 foot wide left turn lane and an 11 foot wide thru lane. The Frank’s Nursery driveway provides a 12 foot wide approach lane with shared turning movements which is controlled by a stop sign. Site Driveway C proposes a 12 foot wide approach lane with shared turning movements which will serve as the north leg of the unsignalized intersection. The proposed Site Driveway C will be controlled by a stop sign. The intersection of NY 100B and the Sprain Brook Parkway southbound on-ramp is a four leg unsignalized intersection. NY 100B is tapering from one lane in the west to two lanes in the east at this intersection. NY 100B eastbound provides one 11 foot wide