HomeMy WebLinkAbout19 - Traffic Impact Study - Catron Crossing Lots 8 & 9memo
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TO: Steve Borup – FLIR Systems, Inc., Government and Defense Business Unit
FROM: Tom Eastwood, PE – Transportation Engineer
DATE: October 29, 2019
JOB NO.: 6327.002
RE: Lots 8 & 9 of Catron Crossing Subdivision Trip Generation Analysis
CC: James (Jim) A. Ullman, PE – Senior Land Development Engineer
Urgent For Review Please Comment Please Reply For Your Use
Purpose of Memorandum
This memorandum provides a comparative analysis of the estimated trip generation for Lots 8 & 9
of Catron Crossing Subdivision based on the proposed general light industrial land use versus
the originally estimated general office building land use included for those lots within the Traffic
Impact Study for Catron Crossing Subdivision prepared by Morrison-Maierle dated August 2017.
Projected Traffic for Lots 8 & 9 Proposed Land Use
Trip generation is a measure or forecast of the number of trips that begin or end at the
development site. The traffic generated is a function of the extent and type of proposed
development. For the proposed general light industrial land use proposed for Lots 8 & 9 of Catron
Crossing Subdivision trip generation rates found in Trip Generation, 10th Edition published by the
Institute of Transportation Engineers (ITE) were utilized for estimating average vehicle trip ends
based on Land Use Code 110 – General Light Industrial. Trip ends are defined as a single or
one-directional travel movement with either the origin or the destination of the trip inside the study
site. The estimated primary purpose trip generation for the proposed development is provided in
Table 1 on the following page.
Catron Crossing Subdivision Traffic Impact Analysis
Lots 8 & 9 were previously evaluated as part of the Traffic Impact Study for Catron Crossing
Subdivision. The site was originally anticipated to be utilized for general office buildings with a
total estimated gross floor area of 40,000 square feet (ft2) comprised of two buildings of
approximately 20,000 ft2 each.
Lots 8 & 9 of Catron Crossing Subdivision Trip Generation Analysis
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Table 1: Proposed General Light Industrial Land Use Estimated Trip Generation Summary
Trip Generation Analysis
Time Period
Entering
Vehicles
Exiting
Vehicles
Total
Vehicles
Estimated Total Trip Generation Summary | General Light Industrial
Units = 61.09 (1,000 Square Feet of Gross Floor Area)
Average Weekday 152 152 304
Average Weekday, A.M Peak Hour,
One Hour Between 7 and 9 a.m. 38 5 43
Average Weekday, P.M Peak Hour,
One Hour Between 4 and 6 p.m. 5 33 38
Average Saturday, Midday Peak Hour,
One Hour Between 11 a.m. and 2 p.m. 12 13 25
Trip generation analyses included as part of the Traffic Impact Study for Catron Crossing
Subdivision were based on Trip Generation, 9th Edition published by ITE in 2012. Land Use Code
710 – General Office Building was utilized in estimating average vehicle trip ends. A summary of
the estimated trip generation for the previously proposed general office building space is provided
in Table 2 below.
Table 2: Original General Office Building Land Use Estimated Trip Generation Summary
Trip Generation Analysis
Time Period
Entering
Vehicles
Exiting
Vehicles
Total
Vehicles
Estimated Total Trip Generation Summary | General Office Building
Units = 40.00 (1,000 Square Feet of Gross Floor Area)
Average Weekday 123 123 246
Average Weekday, A.M Peak Hour,
One Hour Between 7 and 9 a.m. 55 7 62
Average Weekday, P.M Peak Hour,
One Hour Between 4 and 6 p.m. 10 50 60
Average Saturday, Midday Peak Hour,
One Hour Between 11 a.m. and 2 p.m. 9 8 17
Lots 8 & 9 of Catron Crossing Subdivision Trip Generation Analysis
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Comparison Summary
The proposed general light industrial land use is estimated to generate slightly more trips during
the average weekday and Saturday, midday peak hour but fewer trips than the previously
estimated general office building land use during the average weekday, AM and PM peak hours.
A summary of the trip generation analyses is attached for reference. Specifically, the proposed
site results in the following changes to estimated trip ends:
Average Weekday: 58 More Trip Ends
Average Weekday, Peak Hour of 19 Fewer Trip Ends
Adjacent Street Traffic,
One Hour Between 7 and 9 a.m.
Average Weekday, Peak Hour of 22 Fewer Trip Ends
Adjacent Street Traffic,
One Hour Between 4 and 6 p.m.
Average Saturday, Midday Peak Hour 8 More Trip Ends
of Adjacent Street Traffic,
One Hour Between 11 a.m. and 2 p.m.
From the above analyses, it is anticipated that the proposed general light industrial land use would
have less impact to the adjacent transportation network during the average weekday, AM and PM
peak hours, which are typically the most heavy traffic periods. The minor difference during the
average Saturday, midday peak hour is not anticipated to have any significant impact to traffic
operations in the area. The difference in average weekday traffic volumes indicates that the
general light industrial land use with more gross floor area than the previously projected general
office building land use will have slightly more vehicle trips occurring during off-peak periods;
however, they are not anticipated to result in any changes to findings and/or recommendations
included with the Traffic Impact Study for Catron Crossing Subdivision.
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Independent
Variable Units Enter Exit Total Enter Exit Total Enter Exit Total Enter Exit Total
1,000 Square Feet
Gross Floor Area 61.09 152 152 304 38 5 43 5 33 38 12 13 25
1,000 Square Feet Gross Floor Area 40.00 123 123 246 55 7 62 10 50 60 9 8 17
29 29 58 (17)(2)(19)(5)(17)(22)3 5 8
1General Light Industrial - ITE Land Use Code 110 | Independent Variable: 1000 Sq. Feet Gross Floor Area | Setting/Location: General Urban/Suburban
Average Vehicle Trip Ends On a:
Average Vehicle Trip Ends On a:
Average Vehicle Trip Ends On a:
Average Vehicle Trip Ends On a:
1Source:Trip Generation Manual, 10th Edition - Volume 2: Data - Part 1 , Institute of Transportation Engineers (Washington, DC), September 2017
2Source:Trip Generation Manual, 9th Edition, Volume 3: Data, Institute of Transportation Engineers (Washington, DC), 2012
Coefficient of Determination:
T = 0.63(X)13% Entering
87% Exiting R2 = ****
Weekday, PM Peak Hour TripsAverage Weekday Trips Weekday, AM Peak Hour Trips
Average Trip Generation Rate Equation:Directional Distribution:Coefficient of Determination:
General Light Industrial1
Land Use Description
General Office Building2
General Light Industrial versus
General Office Building
Saturday, Midday Peak Hour Trips
LOTS 8 & 9 OF CATRON CROSSING SUBDIVISION - BOZEMAN, MONTANA
TRIP GENERATION ANALYSIS COMPARISON
Total Estimated Trips
Estimated Total Trip Generation for Proposed Land Use
R2 = ****T = Average Vehicle Trip Ends
X = Independent Variable Units
R2 = ****T = Average Vehicle Trip Ends
X = Independent Variable Units
Average Trip Generation Rate Equation:Directional Distribution:Coefficient of Determination:
T = 4.96(X)50% Entering
50% Exiting
Average Vehicle Trip Ends On a:
Weekday, Peak Hour of Adjacent Street Traffic,
One Hour Between 7 and 9 a.m.
Weekday
Average Vehicle Trip Ends On a:
Estimated Total Trip Generation from Original Traffic Impact Study
Total Estimated Trips
2General Office Building - Trip Generation Data (ITE Land Use Code No. 710: General Office Building) | Independent Variable: 1000 Sq. Feet Gross Floor Area
Net Change in Estimated Trip Generation Based on Home 2 Suites by Hilton Proposed Land Use
Net Change in Total Estimated Trips
Average Vehicle Trip Ends On a:Average Trip Generation Rate Equation:Directional Distribution:Coefficient of Determination:
Saturday, Peak Hour of Generator T = 0.41(X)47% Entering53% Exiting R2 = ****
Weekday, Peak Hour of Adjacent Street Traffic,
One Hour Between 4 and 6 p.m.
Average Vehicle Trip Ends On a:
T = 0.70(X)88% Entering
12% Exiting
T = Average Vehicle Trip Ends
X = Independent Variable Units
Average Trip Generation Rate Equation:Directional Distribution:
Average Trip Generation Rate Equation:Directional Distribution:Coefficient of Determination:
Weekday T = 6.15(X)50% Entering
50% Exiting R2 = ****T = Average Vehicle Trip Ends
X = Independent Variable Units
X = Independent Variable Units
Average Trip Generation Rate Equation:Directional Distribution:Coefficient of Determination:
Weekday, A.M. Peak Hour T = 1.56(X)88% Entering
12% Exiting R2 = ****T = Average Vehicle Trip Ends
X = Independent Variable Units
T = Average Vehicle Trip Ends
X = Independent Variable Units
Average Trip Generation Rate Equation:Directional Distribution:Coefficient of Determination:
Saturday, Peak Hour of Generator T = 0.43(X)54% Entering46% Exiting R2 = ****T = Average Vehicle Trip Ends
X = Independent Variable Units
Average Trip Generation Rate Equation:Directional Distribution:Coefficient of Determination:
Weekday, P.M. Peak Hour T = 1.49(X)17% Entering
83% Exiting R2 = ****T = Average Vehicle Trip Ends
N:\6327\002 - Catron Crossing TIS Update\Traffic Data\Trip-Generation_Lots-8+9_Catron-Xing.xlsx - Total Trip Generation Printed On: 10/29/2019 - 11:24 AM