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Home My WebLink AboutTraffic Generation Memorandum with Attachments Engineers Scientists Planners Designers 101 Walnut Street, PO Box 9151, Watertown, Massachusetts 02471 P 617.924.1770 F 617.924.2286 www.vhb.com \\gbldata\projects\Wat-TS\16270.00 11 Potter Ave Hyannis\docs\memos\traffic generation memorandum.docx To: Town of Barnstable Date: January 23, 2024 Project #: 16270.00 From: Randall Hart, Principal Re: Proposed Residential Conversion 11 Potter Avenue, Hyannis Trip Generation Comparison Introduction On behalf of the Proponent, Vanasse Hangen Brustlin, Inc. (VHB) has prepared traffic projections for both the existing use and proposed reuse of the property located at 11 Potter Avenue in Hyannis, Massachusetts. The building currently consists of a 4,548sf facility with approximately 1,742 sf located on the ground floor, approximately 1,277 sf located on the 1st floor, and approximately 1,529 sf located in the basement with walk out. The building was built in 2000 for an outpatient counseling/therapy office (medical office facility) by Cape Cod Healthcare (CCH). Under the proposed redevelopment plan, the first and second floors would be converted to 5 residential apartments, so approximately 3,019 sf will be redeveloped under this proposal. The basement storage would remain unchanged. The following presents a trip generation comparison of the existing versus proposed uses on site. Trip Generation The rate at which any development generates traffic is dependent upon a number of factors such as size, location, and concentration of surrounding developments. The site is currently vacant but was formerly used by CCH for Medical Office purposes. The proposed residential reuse consists of four buildings totaling 5 residential units. Trip generation estimates for the proposed use were projected using trip generation rates published by the Institute of Transportation Engineers (ITE) Trip Generation, 11th Edition1. The number of vehicle-trips generated by the existing medical office use were estimated based on ITE LUC 720 (Medical-Dental Office) which is the “best” fit category available in the ITE manual (description is provided as an attachment). The number of vehicle-trips generated by the proposed residential apartments were estimated based on ITE LUC 220 (Multifamily Housing (low rise)) which is the “best” fit category available in the ITE manual (description is provided as an attachment). The estimated trip generation for each use and calculated change between uses is presented in Table 1 below: 1 Trip Generation, 11th Edition, Institute of Transportation Engineers, Washington D.C., 2021. Town of Barnstable Ref: 16270.00 January 23, 2024 Page 2 \\gbldata\projects\Wat-TS\16270.00 11 Potter Ave Hyannis\docs\memos\traffic generation memorandum.docx Table 1 Trip Generation Summary Residential Vehicle Trips a Medical Dental Office Vehicle Trips b Expected Change c Weekday Daily 34 110 -76 Weekday Morning Peak Hour Enter 0 7 -7 Exit 2 2 0 Total 2 9 -7 Weekday Evening Peak Hour Enter 2 4 -2 Exit 1 8 -7 Total 3 12 -9 a. Trip Generation estimate based ITE LUC 220. (Multi-Family Housing Low rise) for 5 units. b. Trip Generation estimate based ITE LUC 720 (Medical-Dental Office) for 3,019 sf. c. Difference between existing and proposed use; column 2 minus column 1. As shown in Table 1, the proposed re-use of the space (5 residential units) on the first and second floors of the building at 11 Potter Avenue is expected to generate approximately 76 less trips on a daily basis (weekday), 7 less trips during the weekday morning peak hour period and approximately 9 less trips during the weekday evening peak hour period. Town of Barnstable Ref: 16270.00 January 23, 2024 Page 3 \\gbldata\projects\Wat-TS\16270.00 11 Potter Ave Hyannis\docs\memos\traffic generation memorandum.docx Attachments • Trip Generation Worksheets • ITE Land Use Descriptions Land Use: 220 Multifamily Housing (Low-Rise) Description Low-rise multifamily housing includes apartments, townhouses, and condominiums located within the same building with at least three other dwelling units and that have two or three floors (levels). Various configurations fit this description, including walkup apartment, mansion apartment, and stacked townhouse. • A walkup apartment typically is two or three floors in height with dwelling units that are accessed by a single or multiple entrances with stairways and hallways. • A mansion apartment is a single structure that contains several apartments within what appears to be a single-family dwelling unit. • A fourplex is a single two-story structure with two matching dwelling units on the ground and second floors. Access to the individual units is typically internal to the structure and provided through a central entry and stairway. • A stacked townhouse is designed to match the external appearance of a townhouse. But, unlike a townhouse dwelling unit that only shares walls with an adjoining unit, the stacked townhouse units share both floors and walls. Access to the individual units is typically internal to the structure and provided through a central entry and stairway. Multifamily housing (mid-rise) (Land Use 221), multifamily housing (high-rise) (Land Use 222), affordable housing (Land Use 223), and off-campus student apartment (low-rise) (Land Use 225) are related land uses. Land Use Subcategory Data are presented for two subcategories for this land use: (1) not close to rail transit and (2) close to rail transit. A site is considered close to rail transit if the walking distance between the residential site entrance and the closest rail transit station entrance is ½ mile or less. Additional Data For the three sites for which both the number of residents and the number of occupied dwelling units were available, there were an average of 2.72 residents per occupied dwelling unit. For the two sites for which the numbers of both total dwelling units and occupied dwelling units were available, an average of 96.2 percent of the total dwelling units were occupied. The technical appendices provide supporting information on time-of-day distributions for this land use. The appendices can be accessed through either the ITETripGen web app or the trip 252 Trip Generation Manual 11th Edition • Volume 3 generation resource page on the ITE website (https://www.ite.org/technical-resources/topics/trip- and-parking-generation/). For the three sites for which data were provided for both occupied dwelling units and residents, there was an average of 2.72 residents per occupied dwelling unit. It is expected that the number of bedrooms and number of residents are likely correlated to the trips generated by a residential site. To assist in future analysis, trip generation studies of all multifamily housing should attempt to obtain information on occupancy rate and on the mix of residential unit sizes (i.e., number of units by number of bedrooms at the site complex). The sites were surveyed in the 1980s, the 1990s, the 2000s, the 2010s, and the 2020s in British Columbia (CAN), California, Delaware, Florida, Georgia, Illinois, Indiana, Maine, Maryland, Massachusetts, Minnesota, New Jersey, Ontario (CAN), Oregon, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Utah, and Washington. Source Numbers 188, 204, 237, 300, 305, 306, 320, 321, 357, 390, 412, 525, 530, 579, 583, 638, 864, 866, 896, 901, 903, 904, 936, 939, 944, 946, 947, 948, 963, 964, 966, 967, 1012, 1013, 1014, 1036, 1047, 1056, 1071, 1076 253General Urban/Suburban and Rural (Land Uses 000–399) Land Use: 720 Medical-Dental Office Building Description A medical-dental office building is a facility that provides diagnoses and outpatient care on a routine basis but is unable to provide prolonged in-house medical and surgical care. One or more private physicians or dentists generally operate this type of facility. General office building (Land Use 710) and clinic (Land Use 630) are related uses. Land Use Subcategory Analysis of medical-dental office building data found that trip generation rates are measurably different for sites located within or adjacent to a hospital campus and sites that are stand-alone. Data plots are presented for these two land use subcategories. Additional Data The technical appendices provide supporting information on time-of-day distributions for this land use. The appendices can be accessed through either the ITETripGen web app or the trip generation resource page on the ITE website (https://www.ite.org/technical-resources/topics/trip- and-parking-generation/). The sites were surveyed in the 1980s, the 1990s, the 2000s, and the 2010s in Alberta (CAN), California, Connecticut, Kentucky, Maryland, Minnesota, New Jersey, New York, Ohio, Oregon, Pennsylvania, South Dakota, Texas, Virginia, Washington, and Wisconsin. Source Numbers 104, 109, 120, 157, 184, 209, 211, 253, 287, 294, 295, 304, 357, 384, 404, 407, 423, 444, 509, 601, 715, 867, 879, 901, 902, 908, 959, 972 760 Trip Generation Manual 11th Edition • Volume 4 ITE TRIP GENERATION WORKSHEET (11th Edition, Updated 2021) LANDUSE:Multi-Family Housing (Low-Rise): 2-3 Story - Not Close to Rail Transit LANDUSE CODE:220 Independent Variable --- Number of Dwelling Units SETTING/LOCATION:General Urban/Suburban JOB NAME:5 dwelling units JOB NUMBER: RATES:Total Trip Ends Independent Variable Range # Studies R^2 Average Low High Average Low High Enter Exit DAILY 22 0.86 6.74 2.46 12.50 229 33 494 50%50% AM PEAK OF GENERATOR 40 0.76 0.47 0.25 0.98 234 12 1,103 24%76% PM PEAK OF GENERATOR 38 0.80 0.57 0.25 1.26 231 12 1,103 62%38% AM PEAK (ADJACENT ST)49 0.79 0.40 0.13 0.73 249 12 1,103 24%76% PM PEAK (ADJACENT ST)59 0.84 0.51 0.08 1.04 241 12 1,103 63%37% TRIPS:BY AVERAGE BY REGRESSION Total Enter Exit Total Enter Exit DAILY 34 17 17 108 54 54 AM PEAK OF GENERATOR 2 1 2 30 7 23 PM PEAK OF GENERATOR 3 2 1 37 23 14 AM PEAK (ADJACENT ST)2 0 2 24 6 19 PM PEAK (ADJACENT ST)3 2 1 24 15 9 RATES:Total Trip Ends Independent Variable Range # Studies R^2 Average Low High Average Low High Enter Exit DAILY 1 --4.55 4.55 4.55 282 282 282 50%50% PEAK OF GENERATOR 1 --0.41 0.41 0.41 282 282 282 51%49% TRIPS:BY AVERAGE BY REGRESSION Total Enter Exit Total Enter Exit DAILY 24 12 12 ------ PEAK OF GENERATOR 2 1 1 ------ RATES:Total Trip Ends Independent Variable Range # Studies R^2 Average Low High Average Low High Enter Exit DAILY 1 --3.86 3.86 3.86 282 282 282 50%50% PEAK OF GENERATOR 1 --0.36 0.36 0.36 282 282 282 55%45% TRIPS:BY AVERAGE BY REGRESSION Total Enter Exit Total Enter Exit DAILY 20 10 10 ------ PEAK OF GENERATOR 2 1 1 ------ Directional Distribution Directional Distribution Directional Distribution WEEKDAY SATURDAY SUNDAY ITE TRIP GENERATION WORKSHEET (11th Edition, Updated 2021) LANDUSE:Medical-Dental Office Building - Stand Alone LANDUSE CODE:720 Independent Variable --- 1,000 Sq. Feet Gross Floor Area SETTING/LOCATION:General Urban/Suburban JOB NAME:FLOOR AREA (KSF):3.010 JOB NUMBER: RATES:Total Trip Ends Independent Variable Range # Studies R^2 Average Low High Average Low High Enter Exit DAILY 18 0.92 36.00 14.52 100.75 15 1.575 60.000 50%50% AM PEAK OF GENERATOR 21 0.74 3.74 1.21 19.28 15 1.575 60.000 59%41% PM PEAK OF GENERATOR 22 0.95 4.79 1.88 15.55 18 1.575 90.000 40%60% AM PEAK (ADJACENT ST)24 0.80 3.10 0.87 14.30 25 1.575 95.000 79%21% PM PEAK (ADJACENT ST)30 0.77 3.93 0.62 8.86 23 1.575 95.000 30%70% TRIPS:BY AVERAGE BY REGRESSION Total Enter Exit Total Enter Exit DAILY 110 55 55 22 11 11 AM PEAK OF GENERATOR 11 7 5 13 8 5 PM PEAK OF GENERATOR 14 6 9 6 2 3 AM PEAK (ADJACENT ST)9 7 2 10 8 2 PM PEAK (ADJACENT ST)12 4 8 9 3 6 RATES:Total Trip Ends Independent Variable Range # Studies R^2 Average Low High Average Low High Enter Exit DAILY 3 --13.78 5.24 21.93 31.000 26.000 43.000 50%50% PEAK OF GENERATOR 2 --3.02 1.33 4.02 34.000 26.000 43.000 57%43% TRIPS:BY AVERAGE BY REGRESSION Total Enter Exit Total Enter Exit DAILY 42 21 21 ------ PEAK OF GENERATOR 9 5 4 ------ RATES:Total Trip Ends Independent Variable Range # Studies R^2 Average Low High Average Low High Enter Exit DAILY 2 --1.14 0.39 1.58 34.000 26.000 43.000 50%50% PEAK OF GENERATOR 2 --0.22 0.12 0.28 34.000 26.000 43.000 52%48% TRIPS:BY AVERAGE BY REGRESSION Total Enter Exit Total Enter Exit DAILY 4 2 2 ------ PEAK OF GENERATOR 1 0 0 ------ Directional Distribution WEEKDAY Directional Distribution SATURDAY Directional Distribution SUNDAY