HomeMy Public PortalAboutPavillion Traffic Study 3.24.21
Memorandum
To: Mr. Gene Kripak – Landmark Asset Partners
From: Daniel P. Brinkman, P.E., PTOE
Date: March 24, 2021
Subject: Proposed Pavillion Residential Development
SWC Renwick Road at IL Rte 59
Plainfield, Illinois.
Per your request, Gewalt Hamilton Associates, Inc. (GHA) has prepared the following brief review of the anticipated
traffic generations for the residential component of the proposed Pavillion development. As discussed, and similar
to the Briargate development GHA assisted with in Lindenhurst, Illinois. Pavillion, as an age restricted (55+)
development will be expected to have a different trip generation rate and pattern than traditional (non age restricted)
residential units. We offer the following brief comments:
Per the March 25, 2021 Illustrative Master Plan prepared by Landmark Asset Partners, the Pavillion
development will consist of 94 single family homes and 124 duet or duplex style homes that are age restricted
(55+) and a clubhouse on approximately 52-acres. Additionally, the plan will include 8-acres of commercial
development and 5-acres for a Senior Campus.
The following table compares the anticipated Peak Hour and Daily traffic volumes for two different land uses:
Single Family Homes and Senior Adult Housing, based on average rate information published by the Institute of
Transportation Engineers (ITE). Note that ITE does not provide separate calculations for duplex units for either
land use and considers duplex units the same as a detached single family or Senior Adult dwelling unit for trip
generation purposes.
Use ITE Morning Peak Hour Evening Peak Hour Daily
Traditional
Residential
Land Use
Code In Out Sum In Out Sum 24-Hour
94 SF homes # 210 18 54 72 60 35 95 982
124 duplexes # 210 23 70 93 79 46 125 1,257
Subtotal 41 124 165 139 81 220 2,239
94 SF homes # 251 12 27 39 28 18 46 533
124 duplexes # 251 16 32 48 35 22 57 680
Subtotal 28 59 87 63 40 103 1,213
Difference -13 -65 -78 -76 -41 -117 -1,026
Pavillion Development
SWC Renwick Road at IL Rte 59
Plainfield, IL
Gewalt Hamilton Associates, Inc. – Page 2
As can be seen, the age restricted development is expected to generate 78 fewer Morning Peak Hour Trips,
117 fewer Evening Peak Hour Trips, and 1,026 fewer trips on a Daily basis than a traditional residential
development of the same size.
On an average daily basis, a traditional single family home is expected to generate 9.44 trips per dwelling unit.
An age restricted or Senior Adult dwelling unit, by comparison is expected to generate only 4.27 trips per day,
nearly half the traffic by comparison.
Lastly, access points for the proposed residential component are aligned with existing access points on the
north side of Renwick Road. This will allow the Pavillion development to make minor modifications to the
existing pained median to provide left turn lanes into the development.
A detailed Traffic Impact Study will be completed at a future date to determine if any additional improvements or
mitigation of the traffic generated by the development are necessary.
I hope that you find these comments helpful. Should you have any questions, please do not hesitate to contact me
directly at 847-821-6222.
4523.920 Landmark Pavillion Plainfield Trip Memo.doc
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 7 and 9 a.m.
Setting/Location: General Urban/Suburban
Number of Studies: 173
Avg. Num. of Dwelling Units: 219
Directional Distribution: 25% entering, 75% exiting
Vehicle Trip Generation per Dwelling Unit
Average Rate Range of Rates Standard Deviation
0.74 0.33 - 2.27 0.27
Data Plot and Equation
X = Number of Dwelling Units
Trip Gen Manual,10th Ed + Supplement Institute of Transportation EngineersT = Trip EndsStudy Site Average RateFitted Curve
Fitted Curve Equation: T = 0.71(X) + 4.80 R²= 0.89
0 500 1,000 1,500 2,000 2,500 3,000
0
500
1,000
1,500
2,000
9470
72
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 4 and 6 p.m.
Setting/Location: General Urban/Suburban
Number of Studies: 190
Avg. Num. of Dwelling Units: 242
Directional Distribution: 63% entering, 37% exiting
Vehicle Trip Generation per Dwelling Unit
Average Rate Range of Rates Standard Deviation
0.99 0.44 - 2.98 0.31
Data Plot and Equation
X = Number of Dwelling Units
Trip Gen Manual,10th Ed + Supplement Institute of Transportation EngineersT = Trip EndsStudy Site Average RateFitted Curve
Fitted Curve Equation: Ln(T) = 0.96 Ln(X) + 0.20 R²= 0.92
0 500 1,000 1,500 2,000 2,500 3,000
0
500
1,000
1,500
2,000
2,500
9493
96
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday
Setting/Location: General Urban/Suburban
Number of Studies: 159
Avg. Num. of Dwelling Units: 264
Directional Distribution: 50% entering, 50% exiting
Vehicle Trip Generation per Dwelling Unit
Average Rate Range of Rates Standard Deviation
9.44 4.81 - 19.39 2.10
Data Plot and Equation
X = Number of Dwelling Units
Trip Gen Manual,10th Ed + Supplement Institute of Transportation EngineersT = Trip EndsStudy Site Average RateFitted Curve
Fitted Curve Equation: Ln(T) = 0.92 Ln(X) + 2.71 R²= 0.95
0 500 1,000 1,500 2,000 2,500 3,000
0
5,000
10,000
15,000
20,000
94887
982
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 7 and 9 a.m.
Setting/Location: General Urban/Suburban
Number of Studies: 173
Avg. Num. of Dwelling Units: 219
Directional Distribution: 25% entering, 75% exiting
Vehicle Trip Generation per Dwelling Unit
Average Rate Range of Rates Standard Deviation
0.74 0.33 - 2.27 0.27
Data Plot and Equation
X = Number of Dwelling Units
Trip Gen Manual,10th Ed + Supplement Institute of Transportation EngineersT = Trip EndsStudy Site Average RateFitted Curve
Fitted Curve Equation: T = 0.71(X) + 4.80 R²= 0.89
0 500 1,000 1,500 2,000 2,500 3,000
0
500
1,000
1,500
2,000
12492
93
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 4 and 6 p.m.
Setting/Location: General Urban/Suburban
Number of Studies: 190
Avg. Num. of Dwelling Units: 242
Directional Distribution: 63% entering, 37% exiting
Vehicle Trip Generation per Dwelling Unit
Average Rate Range of Rates Standard Deviation
0.99 0.44 - 2.98 0.31
Data Plot and Equation
X = Number of Dwelling Units
Trip Gen Manual,10th Ed + Supplement Institute of Transportation EngineersT = Trip EndsStudy Site Average RateFitted Curve
Fitted Curve Equation: Ln(T) = 0.96 Ln(X) + 0.20 R²= 0.92
0 500 1,000 1,500 2,000 2,500 3,000
0
500
1,000
1,500
2,000
2,500
124123
125
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday
Setting/Location: General Urban/Suburban
Number of Studies: 159
Avg. Num. of Dwelling Units: 264
Directional Distribution: 50% entering, 50% exiting
Vehicle Trip Generation per Dwelling Unit
Average Rate Range of Rates Standard Deviation
9.44 4.81 - 19.39 2.10
Data Plot and Equation
X = Number of Dwelling Units
Trip Gen Manual,10th Ed + Supplement Institute of Transportation EngineersT = Trip EndsStudy Site Average RateFitted Curve
Fitted Curve Equation: Ln(T) = 0.92 Ln(X) + 2.71 R²= 0.95
0 500 1,000 1,500 2,000 2,500 3,000
0
5,000
10,000
15,000
20,000
1241171
1267
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 7 and 9 a.m.
Setting/Location: General Urban/Suburban
Number of Studies: 29
Avg. Num. of Dwelling Units: 583
Directional Distribution: 33% entering, 67% exiting
Vehicle Trip Generation per Dwelling Unit
Average Rate Range of Rates Standard Deviation
0.24 0.13 - 0.84 0.10
Data Plot and Equation
X = Number of Dwelling Units
Trip Gen Manual,10th Ed + Supplement Institute of Transportation EngineersT = Trip EndsStudy Site Average RateFitted Curve
Fitted Curve Equation: Ln(T) = 0.76 Ln(X) + 0.21 R²= 0.89
0 500 1,000 1,500 2,000
0
100
200
300
400
9423
39
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 4 and 6 p.m.
Setting/Location: General Urban/Suburban
Number of Studies: 30
Avg. Num. of Dwelling Units: 582
Directional Distribution: 61% entering, 39% exiting
Vehicle Trip Generation per Dwelling Unit
Average Rate Range of Rates Standard Deviation
0.30 0.17 - 0.95 0.13
Data Plot and Equation
X = Number of Dwelling Units
Trip Gen Manual,10th Ed + Supplement Institute of Transportation EngineersT = Trip EndsStudy Site Average RateFitted Curve
Fitted Curve Equation: Ln(T) = 0.78 Ln(X) + 0.28 R²= 0.87
0 500 1,000 1,500 2,000
0
100
200
300
400
500
600
9428
46
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday
Setting/Location: General Urban/Suburban
Number of Studies: 14
Avg. Num. of Dwelling Units: 655
Directional Distribution: 50% entering, 50% exiting
Vehicle Trip Generation per Dwelling Unit
Average Rate Range of Rates Standard Deviation
4.27 2.90 - 6.66 1.11
Data Plot and Equation
X = Number of Dwelling Units
Trip Gen Manual,10th Ed + Supplement Institute of Transportation EngineersT = Trip EndsStudy Site Average RateFitted Curve
Fitted Curve Equation: Ln(T) = 0.88 Ln(X) + 2.28 R²= 0.92
0 500 1,000 1,500 2,000
0
2,000
4,000
6,000
94401
533
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 7 and 9 a.m.
Setting/Location: General Urban/Suburban
Number of Studies: 29
Avg. Num. of Dwelling Units: 583
Directional Distribution: 33% entering, 67% exiting
Vehicle Trip Generation per Dwelling Unit
Average Rate Range of Rates Standard Deviation
0.24 0.13 - 0.84 0.10
Data Plot and Equation
X = Number of Dwelling Units
Trip Gen Manual,10th Ed + Supplement Institute of Transportation EngineersT = Trip EndsStudy Site Average RateFitted Curve
Fitted Curve Equation: Ln(T) = 0.76 Ln(X) + 0.21 R²= 0.89
0 500 1,000 1,500 2,000
0
100
200
300
400
124
30
48
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday,
Peak Hour of Adjacent Street Traffic,
One Hour Between 4 and 6 p.m.
Setting/Location: General Urban/Suburban
Number of Studies: 30
Avg. Num. of Dwelling Units: 582
Directional Distribution: 61% entering, 39% exiting
Vehicle Trip Generation per Dwelling Unit
Average Rate Range of Rates Standard Deviation
0.30 0.17 - 0.95 0.13
Data Plot and Equation
X = Number of Dwelling Units
Trip Gen Manual,10th Ed + Supplement Institute of Transportation EngineersT = Trip EndsStudy Site Average RateFitted Curve
Fitted Curve Equation: Ln(T) = 0.78 Ln(X) + 0.28 R²= 0.87
0 500 1,000 1,500 2,000
0
100
200
300
400
500
600
12437
57
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday
Setting/Location: General Urban/Suburban
Number of Studies: 14
Avg. Num. of Dwelling Units: 655
Directional Distribution: 50% entering, 50% exiting
Vehicle Trip Generation per Dwelling Unit
Average Rate Range of Rates Standard Deviation
4.27 2.90 - 6.66 1.11
Data Plot and Equation
X = Number of Dwelling Units
Trip Gen Manual,10th Ed + Supplement Institute of Transportation EngineersT = Trip EndsStudy Site Average RateFitted Curve
Fitted Curve Equation: Ln(T) = 0.88 Ln(X) + 2.28 R²= 0.92
0 500 1,000 1,500 2,000
0
2,000
4,000
6,000
124
529
680