83 Longwood Traffic & Parking
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MEMORANDUM TO: 83 Longwood Avenue, LLC FROM: Scott W. Thornton, P.E., and 83 Longwood Avenue Rana Eslamifard Brookline, MA 02446 Vanasse & Associates, Inc. 35 New England Business Center Drive Suite 140 Andover, MA 01810 (978) 474-8800 DATE: July 22, 2021 RE: 8870 SUBJECT: Traffic Assessment - 83 Longwood Avenue, Brookline, MA Vanasse & Associates, Inc. (VAI) has prepared this Traffic Assessment to identify traffic impacts associated with the proposed 64-unit residential development to be located at 83 Longwood Avenue in Brookline, Massachusetts (hereafter referred to as “The Project”). This assessment evaluates the following specific areas as they relate to the Project: i) access requirements; ii) potential off-site improvements; and iii) safety considerations; and identifies and analyzes existing traffic conditions and future traffic conditions, both with and without the Project along Longwood Avenue and the major intersection where Project-related traffic will travel. This assessment was prepared in consultation with the Town of Brookline and the Massachusetts Department of Transportation (MassDOT) and was performed in accordance with MassDOT’s TIA Guidelines and standards of the Traffic Engineering and Transportation Planning Pro- fessions for the preparation of such reports. PROJECT DESCRIPTION Currently, 83 Longwood Avenue is occupied by a rooming house known as the Longwood Guest House with 25 parking spaces. The Project involves redeveloping the site into a residential development providing 64 apartment units. An at-grade and a sub-grade garage door will be provided. The at-grade and sub-grade parking garages will be naturally and mechanically ventilated, respectively. A total of 73 parking spaces will be provided on-site via a parking garage below the apartment units. The site will also provide 1 bicycle parking space per unit for a total of 64 bike spaces. Access to the site will be provided by way of a curb cut onto Longwood Avenue on the west side of the property in the same location as the existing driveway to the site. In addition, a new 7-foot-wide by 40-foot-long non-exclusive drop-off/loading zone will be provided in front of the site frontage on Longwood Avenue. Figure 1 depicts the location of the site relative to the surrounding area. There will be 20 at-grade parking spaces and 53 sub-grade parking spaces that are comprised of 3-tier stacker spaces. The parking spaces include 4 accessible parking spaces with parking ratio of 1.14 spaces per unit. This parking ratio is within the range of values documented1 by the Institute of Transportation 1Parking Generation Manual, 5th Edition; Institute of Transportation Engineers; Washington, D.C.; 2019. The observed parking demand ratio for a multifamily (mid-rise) residential community was reported to range between 0.75 to 2.03 parking spaces per dwelling units. G:\8870 Brookline, MA\Memos\8870 D. Danesh 072221.docx 1 Traffic Assessment - 83 Longwood Avenue - Brookline, Massachusetts CHARLES STREET BEACON STREET AVENUE SAINT PAUL SEWALL SITE LONGWOOD AVENUE HARVARD STREET STREET STEARNS ROAD Source: Google Earth N 0 100 200 Scale in Feet Figure 1 Site Location Map Vanasse & Associates inc R:\8870\8870SLM.dwg, 2/2/2021 11:12:33 AM, DWG To PDF.pc3 Engineers (ITE) for similar multifamily residential communities. EXISTING CONDITIONS A comprehensive field inventory of existing conditions on the study area roadways was conducted in June 2021. The field investigation consisted of an inventory of existing roadway geometrics; pedestrian and bicycle facilities; traffic volumes; and operating characteristics; as well as posted speed limits; and land use information. The study area for the Project contains the major roadway which provides access to the Project site including Longwood Avenue as well as the intersections of Saint Paul Street at Longwood Avenue and Saint Paul Street at Sewall Avenue which are expected to accommodate the majority of Project- related traffic. The following summarizes the existing conditions within the study area. Roadways Longwood Avenue Longwood Avenue is classified as an urban minor arterial under the jurisdiction of the Town of Brookline. Longwood Avenue runs in a general east-west alignment from Harvard Street in Brookline to the Town property line with Boston. Longwood Avenue allows two-way travel separated by a double yellow centerline. The land uses along Longwood Avenue Street generally consist of residential properties. There is a bicycle lane on Longwood Avenue eastbound. Intersections Figure 2 and the following summarizes existing lane use and travel lane widths at the study area intersec- tions as observed in June 2021. Saint Paul Street at Longwood Avenue Longwood Avenue is intersected by Saint Paul Street from the north and south to form this four-way intersection under traffic signal control. Direction of travel on Longwood Avenue and Saint Paul Street is separated by a double yellow centerline. Illumination is provided via streetlights mounted on wooden utility poles. Land use in the vicinity of this intersection consists of residential properties. This intersection is under the jurisdiction of the Town of Brookline. Saint Paul Street at Sewall Avenue Sewall Avenue is intersected by Saint Paul Street from the north and south to form this four-way unsignalized intersection. Direction of travel on Sewall Avenue and Saint Paul Street is separated by a double yellow centerline. Illumination is provided via streetlights mounted on wooden utility poles. Land use in the vicinity of this intersection consists of residential properties. This intersection is under the jurisdiction of the Town of Brookline. Traffic Volumes In order to determine existing traffic-volume demands and flow patterns within the study area, manual Turning Movement Counts (TMCs) and vehicle classification counts were completed in June 2021 at the study area intersections. Automatic Traffic Recorder (ATR) counts were conducted on June 16 through G:\8870 Brookline, MA\Memos\8870 D. Danesh 072221.docx 2 Traffic Impact Assessment - Proposed Residential Development, 83 Longwood Avenue - Brookline, Massachusetts Legend: S Signalized Intersection U Unsignalized Intersection Sidewalk Crosswalk Lane Use and Travel Lane Width STOP Sign Bike Lane U S U SITE N Not To Scale Figure 2 Existing Intersection Lane Use, Vanasse & Travel Lane Width and Associates inc Pedestrian Facilities R:\8870\8870NT1 0621.dwg, 7/20/2021 4:27:34 PM June 17, 2021 (Wednesday through Thursday, inclusive) on Longwood Avenue in the vicinity of the Project site in order to record weekday traffic conditions over an extended period, with weekday morning (7:00 to 9:00 AM) and weekday evening (4:00 to 6:00 PM) peak period manual TMCs performed at the study intersections on June 16, 2021 (Wednesday). These time periods were selected for analysis purposes as they are representative of the peak-traffic-volume hours for both the Project and the adjacent roadway network. In order to account for the reduction in traffic volumes caused by the COVID-19 travel restrictions, a review of MassDOT traffic count data and pre- and post-COVID traffic-volume data that was obtained by VAI as a part of a previous study in the area was performed. Traffic-volume data collected at permanent count station ID AET12 located on Massachusetts Turnpike in June 2021 was compared to June 2019 traffic volumes that were collected at the same location.2 In addition, the traffic-volume data that was conducted by VAI for the intersection of School Street at Harvard Street and Aspinwall Avenue in April 2021 were compared to the November 2017 traffic volumes that were collected at the same location. Based on these comparisons, the average COVID adjustment factor of 28.0 percent was applied to June 2021 traffic volumes. In order to evaluate the potential for seasonal fluctuation of traffic volumes within the study area, traffic volume data from MassDOT Continuous Count Station AET 13 located on Massachusetts Turnpike (I-90) in Boston was reviewed.3 Based on a review of seasonal adjustment factors collected by MassDOT for urban arterials and collectors, the June traffic volumes are typically 5.0 percent higher than average monthly conditions, and therefore were not adjusted in order to represent a conservative analysis condition. The 2020 Existing traffic volumes are summarized in Table 1, with the weekday morning and evening peak- hour traffic volumes graphically depicted on Figure 3. Table 1 2021 EXISTING TRAFFIC VOLUMES Longwood Avenue, east of site driveway/ Directional Time Period ADTa VPHb K Factorc Distributiond Daily 10,380 -- -- -- Weekday Morning (7:45 – 8:45 AM) -- 641 6.2 61.0% EB Weekday Evening (4:30 – 5:30 PM) -- 796 7.7 51.0% WB aAverage daily traffic in vehicles per day.(COVID adjustment factor applied to ATR counts) bVehicles per hour. cPercent of daily traffic occurring during the peak hour. dPercent traveling in peak direction. EB= eastbound; WB=westbound As can be seen in Table 1, Longwood Avenue, in the vicinity of the site driveway, was found to accommodate approximately 10,380 vehicles on an average weekday (two-way, 24-hour volume), with approximately 641 vehicles per hour (vph) during the weekday morning peak-hour and 796 vph during the weekday evening peak-hour. 2MassDOT Traffic Volumes for the Commonwealth of Massachusetts; 2021. 3Ibid. G:\8870 Brookline, MA\Memos\8870 D. Danesh 072221.docx 3 Traffic Impact Assessment - Proposed Residential Development, 83 Longwood Avenue - Brookline, Massachusetts WEEKDAY MORNING PEAK HOUR (7:45 - 8:45 AM) SITE WEEKDAY EVENING PEAK HOUR (4:30 - 5:30 PM) SITE N Not To Scale Figure 3 Vanasse & 2021 Existing Associates inc Peak Hour Traffic Volume R:\8870\8870NT1 0621.dwg, 6/28/2021 2:39:52 PM Alternative Transportation As a residential development, the Project is poised to take advantage of the multiple levels of alternative transportation in the area. The MBTA operates fixed-route bus services in the vicinity of the site.