HomeMy WebLinkAbout05.2 20211030_21-0107_Trip-Gen-Summary
619 Milestone Drive
Belgrade, MT 59714
E5EngineeringPLLC@gmail.com
(406) 209-3960
October 30, 2021
Celine Saucier, PE
Morrison-Maierle
2880 Technology Boulevard West
Bozeman, MT 59718
Re: Trip Generation Comparative Analysis for Lot 13, Building I | Northwest Crossing Subdivision
E5 Engineering, PLLC Project No. 21-0107
Dear Celine:
This letter summarizes the findings from the trip generation comparative analysis for the proposed commercial shell
building to be located on Lot 13 of Northwest Crossing Subdivision. This lot was included in Parcel A of the
Transportation Planning Study: Northwest Crossing (Tract 5 of Certificate of Survey 2552, 5250 Baxter Lane,
Gallatin County, Montana) prepared by Morrison-Maierle dated August 2019.
Parcel A was evaluated under the Institute of Transportation Engineers (ITE) Land Use Code 770: Business Park in
the original transportation planning study, having a total estimated building gross floor area of approximately
92,000 square feet (ft2). Based on the ITE Trip Generation Manual, 10th Edition (2017), the business park land use
for Parcel A had an estimated vehicle trip generation of 1,144 average weekday trips and AM and PM peak hour trip
projections of 37 and 39 vehicles, respectively. As described in the ITE Trip Generation Manual, “A business park
consists of a group of flex-type or incubator one- or two-story buildings served by a common roadway system. The
space may include offices, retail and wholesale stores, restaurants, recreational areas and warehousing,
manufacturing, light industrial, or scientific research functions.”
The proposed commercial shell building on Lot 13 of the Northwest Crossing Subdivision is proposed to be
approximately 21,140 ft2 of gross floor area. For the trip generation analysis, the proposed building was evaluated
as a 50/50 mix of general office and commercial space. The proposed building has an estimated vehicle trip
generation of 692 average total weekday trips plus 46 AM and 110 PM peak hour trips.
The analyses were based on the ITE Trip Generation Manual, 11th Edition published in September 2021 for Land
Use Code 710: General Office Building and Land Use Code 822: Strip Retail Plaza (<40k). The general office land
use is self-explanatory. The strip retail plaza (<40k) land use was added to the Trip Generation Manual, 11th Edition
as a subset of Land Use Code 820: Shopping Center. ITE characterizes a strip retail plaza as “an integrated group of
commercial establishments that is planned, developed, owned, and managed as a unit. Each study site in this land
use has less than 40,000 square feet of gross leasable area (GLA). Because a strip retail plaza is open-air, the GLA
is the same as the gross floor area of the building.”
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Trip Generation Comparative Analysis for Lot 13, Building I | Northwest Crossing Subdivision October 30, 2021
F:\E5 Engineering PLLC\Projects\21-0107 - NW Xing Subdivision Parcel A\20211030_21-0107_Trip-Gen-Summary.docx Page 2 of 2
From the attached analyses, the proposed building has projected vehicular trips more than what was originally
forecast for Parcel A during the weekday, AM and PM peak hours. However, internal trip capture that is a
characteristic of the Business Park land use is not accounted for in the analyses for the proposed building on Lot 13
with it being the first proposed development within the subdivision. It is anticipated that as the Northwest Crossing
Subdivision builds out there will be an increase in internal trips within the development. Nonetheless, the limited
volume of vehicular trips projected with the proposed commercial building on Lot 13 is not anticipated to have any
adverse effects on the adjacent transportation system requiring additional mitigation.
Usage of ITE trip generation rates can produce conservative estimates based on the locations, size of developments,
and characteristics of the surrounding area where studies were completed that were utilized in development of the
rates found in the Trip Generation Manual. If desired, local trip generation data may be able to be obtained for
similar building uses and gross floor areas to evaluate estimated vehicle trip generation for the proposed site.
Thank you for the opportunity to work with you on this project. I look forward to serving you in the future. If you have
any questions or concerns regarding the analyses, please do not hesitate to contact me.
Sincerely,
Tom Eastwood, PE, PTOE
Owner
Encl.: Trip Generation Comparative Analysis (2 Pages)
cc: Matt Ekstrom, PE – Morrison-Maierle
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