Item 6E and 6F - Lee Traffic Letter7LEE mana:vnc
October 28, 2021
Mr. Aaron Bidne
Granite Properties
5601 Granite Parkway, Suite 1200
Plano, TX 75024
Re: Trip Generation Characteristics for Southlake Town Square Block 16
Dear Mr. Bidne:
ARIZONA
TEXAS
NEW MEXICO
OKLAHOMA
Lee Engineering has analyzed the trip generation characteristics of the proposed development to be
located on Block 16 in Southlake Town Square in Southlake, Texas. The current development
proposal includes a total of 305,000 SF of office space and 22,000 SF of restaurant space.
The number of trips generated by a development is a function of the type and quantity of the land
use of the development. The number of vehicle trips generated by the proposed development was
estimated based on trip generation information provided in the publication entitled Trip Generation
Manual, 10th Edition, by the Institute of Transportation Engineers (ITE). The trip generation rates
for the proposed development and the entering/exiting splits for traffic generated by the
development are shown in Table 1. This table also presents the estimated number of trips
generated by the proposed development. As shown in Table 1, the proposed development is
predicted to generate 4,974 trips on a daily basis with 329 trips during the AM peak hour and 500
trips during the PM peak hour.
Lee Engineering completed a traffic study for Block 16 in 2015. The proposed development in 2015
included 340,300 SF of office space and 27,000 SF of restaurant space. One 154,000 SF office
building with supporting parking garage from that proposal has been built. Trip generation
estimates that were used in that study are presented in Table 2. These calculations were done using
a prior edition of the Trip Generation Manual. As can be seen, the daily and peak hour trip
generation estimates are lower for the currently proposed development and thus the impacts of the
development on area traffic should be less than identified in the 2015 study.
3030 LBJ Freeway, Suite 1660, Dallas, TX 75234
(972) 248-3006 office (972) 248-3855 fax I www.leeengineering.com Page 1 of 3
Table 1: Trip Generation — Proposed Block 16 Development 2021
Land Use
ITE
Variable
Average Weekday
AM Peak Hour
PM Peak Hour
Code
(X)
Equation/Rates'
General
710
1000 Sq
Ln(T) = 0.97Ln(X) +
T = 0.94(X) +
Ln(T) = 0.95Ln(X) +
Office
Ft GFA
2.5
26.49
0.36
Quality
931
1000 Sq
T = 83.84(X)
T = 0.73(X)
T = 7.8(X)
Restaurant
Ft GFA
Directional Splits2
General
710
1000 Sq
50/50
86/14
16/84
Office
Ft GFA
Quality
931
1000 Sq
50/50
50/503
67/33
Restaurant
Ft GFA
Trips Generated
Land Use
Amount
Variable
Total
Enter
Exit
Total
Enter
Exit
Total
Enter
Exit
General
305
1000 Sq
3,130
1,565
1,565
313
269
44
328
52
276
Office
Ft GFA
Quality
22
1000 Sq
1,844
922
922
16
8
8
172
115
57
Restaurant
Ft GFA
Total Trips
4,974
2,487
2,487
329
277
52
500
167
333
T= Trip Ends; X = 1,000 Square Feet
2 XX/yy = % entering vehicles / % exiting vehicles.
s This number was assumed as no data was available.
LCC rcnei IramnC Page 2 of 3
Table 2: Trip Generation — Proposed Block 16 Development 2015
Land Use
ITE
Code
Variable
(X)
Average Weekday
AM Peak Hour
PM Peak Hour
Equation/Rates'
General
710
1000 Scl Ft
T = 11.03(X)
T = 1.56 (X)
T = 1.49(X)
Office
GFA
Quality
931
1000 Scl Ft
T = 89.95(X)
T = 0.81(X)
T = 7.49(X)
Restaurant
GFA
Directional Splits2
General
710
1000 Scl Ft
50/50
88/12
17/83
Office
GFA
Quality
931
1000 Scl Ft
50/50
50/503
67/33
Restaurant
GFA
Trips Generated
Land Use
Amount
Variable
Total
Enter
Exit
Total
Enter
Exit
Total
Enter
Exit
General
340.3
1000 Scl Ft
3,754
1,877
1,877
531
467
64
507
86
421
Office
GFA
Quality
27
1000 Scl Ft
2,428
1,214
1,214
22
11
11
202
135
67
Restaurant
GFA
Total Trips
6,182
3,091
3,091
553
478
75
709
221
488
T= Trip Ends; X = 1,000 Square Feet
2 XX/yy = % entering vehicles / % exiting vehicles.
3 This number was assumed as no data was available.
Please let me know if you need any additional information on this matter.
Sincerely,
�
Digitally signed by
� Joseph T Short
Date:2021.10.28
17:14:44-05'00'
Joseph T. Short, P.E., PTOE
President
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