HomeMy WebLinkAbout005.01 - Appendix D.1 - Trip_Gen_Addendum
December 18, 2024
Mr. Sam Kendall
Jackadoo, LP
Brick Capital
1907 Pine Street
Philadelphia, PA 19103
Reference: Block 104 Traffic Impact Study, Trip Generation Update
Project No. 06020.11
Dear Mr. Kendall,
The purpose of this letter is to provide an addendum to the Block 104 Traffic Impact
Study (TIS) to meet the requests set forth by the City of Bozeman. The TIS was
originally completed by Sanbell (formerly Sanderson Stewart) in December of 2023.
It was requested by the City that updated trip generation calculations be performed
to account for the planned commercial space on the first floor of the south building.
The total number of residential units has been reduced since completion of the
original TIS, so it will be presented that the net change in trip generation for the
development is insignificant and therefore the findings from the original TIS are still
applicable.
The updated site plan for Bozeman Yards proposes 26 units in the north building and
42 units in the south building for 68 total dwelling units, with 1,759 square-feet of
commercial retail use also in the south building. The original Block 104 TIS proposed
76 total residential dwelling units.
The updated trip generation calculations utilized Trip Generation, 11th Edition published
by the Institute of Transportation Engineers (ITE), which is the most widely accepted
source in the United States for determining trip generation projections. Multifamily
Housing (Mid-Rise) (Land Use Code 221) and Strip Retail Plaza (<40k) (Land Use Code
822) were used to project trip generation for the Bozeman Yards site. Table 1 on the
following page illustrates the results of the trip generation calculations, including a
comparison to the original Block 104 total trip projections.
Mr. Sam Kendall
December 18, 2024
Page 2
With the updated residential unit totals and commercial space, the Bozeman Yards
site is projected to generation 407 gross average weekday trips, with 29 trips (8
entering/21 exiting) generated during the AM peak hour and 39 trips (22 entering/17
exiting) generated during the PM peak hour.
Trip generation projections provide an estimate of the total number of trips that
would be generated by a proposed development. However, in order to estimate the net
number of new trips made by personal vehicles external to the site, adjustments
must often be made to account for internal capture trips, pass-by trips, and trips
made by alternate modes.
Internal capture (IC) trips are trips that do not have origins or destinations external
to a project site and therefore do not have an impact on external traffic operations. IC
trips most often occur in mixed-use developments where residential, commercial,
and office-related land uses exhibit a high rate of internal trip exchange. IC trips were
therefore calculated between the residential units and the proposed commercial
space.
Pass-by trips are trips that are made as intermediate stops on the way from a point of
origin to a primary trip destination. Pass-by trips are attracted from traffic “passing
by” on an adjacent street that offers direct access to the site. Pass-by trips are
Table 1: Updated Trip Generation Summary
Intensity Units total enter exit total enter exit total enter exit
Multifamily Housing (Mid-Rise)1 76 Dwelling Units 345 173 172 28 6 22 30 18 12
Multifamily Housing (Mid-Rise)1 68 Dwelling Units 309 155 154 25 6 19 27 16 11
17 10 7 0 0 0 3 2 1
Strip Retail Plaza (<40k)2 1.795 1000 SF GFA 98 49 49 4 2 2 12 6 6
17 7 10 0 0 0 3 1 2
407 204 203 29 8 21 39 22 17
34 17 17 0 0 0 6 3 3
373 187 186 29 8 21 33 19 14
28 14 14 1 2 -1 3 1 2
(1) Multifamily Housing (Mid-Rise) - Land Use 221* Units = Dwelling Units
Average Weekday: Average Rate = 4.54 (50% entering/50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM: Average Rate = 0.37 (23% entering/77% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM: Average Rate = 0.39 (61% entering/39% exiting)
(2) Strip Retail Plaza (<40k) - Land Use 822* Units = 1000 Sq. Ft. GFA
Average Weekday: Average Rate = 54.45 (50% entering/50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM: Average Rate = 2.36 (60% entering/40% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM: Average Rate = 6.59 (50% entering/50% exiting)
*Trip Generation, 11th Edition, Institute of Transportation Engineers, 2021
**Trip Generation Handbook, 3rd Edition, Institute of Transportation Engineers, 2017
Independent Variable Average Weekday
Bozeman Yards Gross Trips
PM Peak HourLand Use AM Peak Hour
Internal Capture Trips**
Internal Capture Trips**
Bozeman Yards Internal Capture Trips
Bozeman Yards New External Trips
Net New External Trips
Updated Bozeman Yards Proposed Land Uses
Original Block 104 TIS Trip Generation
Mr. Sam Kendall
December 18, 2024
Page 3
primarily attracted by commercial type land uses such as restaurants, convenience
markets, and gas stations. Although pass-by trips often occur at commercial uses,
ITE does not provide pass-by rates for the land use assumed in this analysis.
Therefore, no pass-by reductions were assumed.
A portion of external trips generated by the development could be made by alternate
modes (walking, biking, and transit), thereby reducing vehicular trips generated.
There are bike lanes, sidewalks, and/or multi-use paths accessing the site from most
directions but, to be consistent with the original TIS, alternate mode trips were
conservatively assumed to be negligible for the purposes of this study.
When comparing the new trip generation projections for the Bozeman Yard site to the
original Block 104 TIS, it was found that 28 additional daily trips are projected with
the updated land uses. In the AM peak hour, 1 net additional trip is projected (2
entering/-1 exiting) and 3 net additional trips are projected in the PM peak hour (1
entering/2 exiting). This corresponds to an increase of 8 percent in total daily trips, 4
percent in AM peak hour trips, and 10 percent in PM peak hour trips.
The above values are negligible when compared to the total trip generation and would
not alter the analysis or results presented in the original Block 104 TIS. Therefore, the
updated land use projections are adequately represented by the original TIS and all
findings presented therein remain relevant and should be implemented.
If you have any questions or concerns, please feel free to contact me at 406-922-4326
or jstaszcuk@sanbell.com.
Sincerely,
Joey Staszcuk, PE, PTOE, RSP1
Associate Principal | Community Transportation Studio Manager
ARS/jhs/SG
P:06020.11_Block_104_Update_12.18.2024