HomeMy WebLinkAbout019 - EXHIBIT N - TRIP GENERATION LETTER
September 11, 2025
Greg McFarland
Idaho Pole Company
3325 Meridian Ave East Suite 4
Edgewood WA, 98371
Reference: Trip Generation Letter – Idaho Pole Annexation
Project No. 24107
Dear Greg:
The purpose of this letter is to provide trip generation estimates as well as a
comparison of existing and proposed traffic demand for the proposed development
to be constructed on Parcels I, II, and V of the Idaho Pole Annexation along L Street in
Bozeman, Montana. The site plan proposes to construct 27 attached and 30 detached
single-family homes across the three parcels.
Trip Generation
The trip projection analysis utilized Trip Generation, 11th Edition, published by the
Institute of Transportation Engineers (ITE), which is the most widely accepted source
for determining trip generation projections. Single-Family Detached Housing – Land
Use 210 and Single-Family Attached Housing – Land Use 215 were used to calculate
the weekday, AM, and PM peak hour trip generation estimations for the development.
Projected trip generation values for the proposed site are shown in Table 1 below.
Table 1: Idaho Pole Annexation Trip Generation Summary
Intensity Units total enter exit total enter exit total enter exit
30 Dwelling Units 283 141 142 21 5 16 28 18 10
27 Dwelling Units 194 97 97 13 3 10 15 9 6
477 238 239 34 8 26 43 27 16
(1) Single-Family Detached Housing - Land Use 210* Units = Dwelling Units
Average Weekday Average Rate = 9.43 (50% entering/50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM: Average Rate = 0.70 (25% entering/75% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM: Average Rate = 0.94 (63% entering/37% exiting)
(2) Single-Family Attached Housing - Land Use 215* Units = Dwelling Units
Average Weekday Average Rate = 7.20 (50% entering/50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM: Average Rate = 0.48 (25% entering/75% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM: Average Rate = 0.57 (59% entering/41% exiting)
*Trip Generation, 11th Edition, Institute of Transportation Engineers, 2021
**Trip Generation Handbook, 3rd Edition, Institute of Transportation Engineers, 2017
Land Use
Independent Variable Average Weekday AM Peak Hour PM Peak Hour
Single-Family Detached Housing1
Single-Family Attached Housing2
Idaho Pole Annexation External Trips
Mr. Greg McFarland
September 11, 2025
Page 2
Full buildout of the Idaho Pole Annexation is projected to generate a total of 477 gross
average weekday trips with 34 trips (8 entering/26 exiting) generated during the AM
peak hour and 43 trips (27 entering/16 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. Since IC trips occur internally, they 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 and were therefore not calculated for this site.
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
primarily attracted by commercial type land uses such as restaurants, convenience
markets, and gas stations, and were therefore also not calculated for this site.
External trips made by alternative modes (walking, biking, transit) are not
anticipated to be prevalent for this site due to the distance to services in Bozeman
and lack of bicycle/pedestrian facilities on L Street and thus were considered
negligible for the purposes of this analysis.
Traffic Demand Comparison
To compare the existing and proposed traffic demand, average annual daily traffic
(AADT) data was utilized from an MDT continuous traffic counter located at the
railroad crossing of L Street/North Wallace Avenue. The AADT count for 2024 at this
location was 1,752 vehicles. Upon completion of the Idaho Pole Annexation
development, there will be an average daily increase of 477 vehicles (27 percent) on L
Street. It is anticipated that a majority of site generated trips will be towards the
south in the direction of Bozeman’s city center.
Mr. Greg McFarland
September 11, 2025
Page 3
Conclusion
The Idaho Pole Annexation site is projected to generate 477 new external trips on an
average weekday with 34 trips generated during the AM peak hour and 43 trips being
generated during the PM peak hour. The development is anticipated to increase
traffic volumes on L Street by up to 27 percent.
If you have any questions or concerns, please feel free to contact me at 406-992-4326
or astoltzfus@sanbell.com.
Sincerely,
Audrey Stoltzfus, PE, RSP2I
Project Engineer
KRK/ars/SG
P:2417_Idaho_Pole_Annexation_Trip_Generation_9.11.2025