HomeMy WebLinkAbout014_Trinity Church Trip Generation Report MARVIN & ASSOCIATES 1300 N. Transtech Way Billings, MT 59102
Mailing Address: P.O. Box 80785 Billings, MT 59108-0785 Phone: 406-655-4550 FAX: 406-655-4991
Email: bobm@marvinassociates.com
Zach Lowe, P.E.
Stahly Engineering
851 Bridger Drive, Suite #1
Bozeman, MT 59715
April 29, 2020
Re: Trinity Church Development
This letter summarizes our trip generation analysis for the Trinity Church
Development located in the northwest corner of the Durston Road and Ferguson
Avenue intersection in Bozeman, Montana. The Trinity Church development
would be constructed in two phases.
Phase 1 would be a 10,100 square foot building that would house church offices
and a Ministry Center/Youth Group room. This will be used for smaller worship
services (possibly funerals, weddings, baptisms, etc.) as well as their weekly youth
group, Bible study, women/men’s groups. The office wing will accommodate 9
workspaces. Phase 2 is planned to add approximately 30,500 SF. With the
addition of Phase 2, the entire building would be approximately 40,600 SF. The
Sanctuary space is designed to accommodate 650 people per service.
The ITE Trip Generation Report, 10th Edition was used to predict the relative
number of trips that would be generated by this development. Land Use Code 560
“Church” (see attachment) was determined to be the most similar land use for this
development. There are several time periods associated with trip generation rates
for Land Use Code 560. The attached table provides trip generation summaries
for seven different time periods that would be applicable to the Trinity Church
Development. Average Weekday Trips (AWT) quantifies additional trips on the
adjacent street system over a 24-hour period. Peak AM and PM hour trips are site
trips that would occur when traffic of the adjacent street system peaks, while peak
AM and PM generator trips are associated with site trips that are not necessarily
coincident with peak periods on the adjacent street system. The highest trip
generation potential for this development would be on Sundays, when 24-hour and
peak hour traffic on the surrounding street system is at its lowest level.
The attached trip generation table indicates that Phases 1 and 2 of site
development would generate relatively minor traffic volumes on the adjacent street
system during weekday time periods, while Sundays would have substantially
more traffic, especially during peak generator hours. The peak hours on Sunday
would generate 101 trips for Phase 1 development and when Phase 2 is completed
there would be 406 trips. It should be noted that the Sunday peak hour should be
divided by approximately two to reflect the fact that there would actually be two
peaks corresponding to two church service times, one starting and 8:30 AM and
the other at 10:30 AM.
MARVIN & ASSOCIATES 1300 N. Transtech Way Billings, MT 59102
Mailing Address: P.O. Box 80785 Billings, MT 59108-0785 Phone: 406-655-4550 FAX: 406-655-4991
Email: bobm@marvinassociates.com
From this trip generation analysis and other similar traffic studies that we have
conducted for churches in the past, it can be conclude that the proposed Trinity
Church Development would not add an appreciable volume of traffic to the
surrounding street system on the average weekday. However, Sunday trip
generation can be significantly different. Sunday trips are five times the AWT
volumes and peak hour traffic periods have high traffic demands. After the
services are complete, site egress volumes typical occur over a 15 to 20-minute
period. Fortunately, adjacent street traffic is significantly less during the peak
Sunday hours without commuter and school traffic competing for system capacity.
If there are any other clarifications or information required, feel free to contact me.
Robert R. Marvin, P.E., P.T.O.E.
Trip Rate
/1000 SF Phase 1 Phase 2 Phase 1&2
Ave. Weekday 6.95
Total 70 212 282
7-9 AM Hour 0.33
Total 3 10 13
Enter 2 6 8
Exit 1 4 5
4-6 PM Hour 0.49
Total 5 15 20
Enter 2 7 9
Exit 3 8 11
Peak AM Generator 0.65
Total 7 20 27
Enter 4 11 15
Exit 3 9 12
Peak PM Generator 0.80
Total 8 24 32
Enter 5 15 20
Exit 3 9 12
Sunday 27.63
Total 279 843 1122
Sunday Peak Hour 9.99
Total 101 305 406
Enter 48 146 194
Exit 53 159 212
1,000 SF Phase 1 = 10.1
1,000 SF Phase 2 = 30.5
Time Period
Trinity Church Development Trip Generation
Number of Trips