Item 6B Consultant TIA Review ARIZONA
TEXAS
NEW MEXICO
OKLAHOMA
7L1EEF.nanEE:nnc
September 21, 2017
Steven D. Anderson, P.E., CFM
City of Southlake
1400 Main Street, Suite 320
Southlake,Texas 76092
Re: Highland Corner Traffic Study—Review of Revised TIA
Dear Mr. Anderson:
Per your request, we have completed a review of the revised traffic study for the proposed Highland Corner
development. The proposed development will be located on the southwest corner of the intersection of
Kimball Avenue and Highland Street in Southlake,Texas. The traffic study was prepared by Kelly&Associates
and dated September 5, 2017.
Our review comments are numbered for ease of reference and the numbering does not imply any ranking.
We have divided our comments into two categories — Informational Comments are those that require no
action by the city or the applicant. Action Comments are those that require a response or action by the City
or applicant.We offer the following comments on the submitted study.
INFORMATIONAL COMMENTS(REQUIRE NO ACTION BY CITY OR APPLICANT)
1. The proposed site will include a mix of general office and medical/dental office buildings.
2. Based on an updated site plan shown in the TIA, the Highland Corner development is anticipated to
include 19,256 square feet of general office space and 25,000 square feet of medical office space,
with seven buildings in total.
3. The proposed development is predicted to generate approximately 111 trips in the AM peak hour
(92 in and 19 out) and approximately 184 trips during the PM peak hour(41 in and 143 out).
4. The directional distribution used for this study was 20%to/from the north, 25%to/from the south,
10%to/from the east, and 45%to/from the west.
5. Existing traffic volumes were collected during the PM peak hour on Tuesday, June 27, 2017, and
during the AM peak hour on Thursday, August 31, 2017.
6. The Highland Corner development will include two (2) full-access site driveways along Kimball
Avenue located at existing median openings (at Yeargain Court and at Shady Lane). Northbound left
turn lanes are already constructed at these median openings. Southbound right turn deceleration
lanes were not proposed with this study.
3030 LBJ Freeway,Suite 1660, Dallas,TX 75234
(972)248-3006 office (972)248-3855 fax I www.leeengineering.com Page 1 of 2
7. According to the study, the driveways for the site have adequate sight distance for passenger car
traffic.
8. Based on the analysis presented in this study, no changes to the roadway network are proposed
external to the site to accommodate site traffic. We agree with the conclusion that no mitigation
measures will be required for this development.
9. Please note that the site plan shown in the TIA(Figure 2) is still difficult to read.
10. Existing PM traffic volumes are still not grown to reflect higher expected volumes during the school
year. In addition, additional growth was not applied to existing traffic volumes and no future-year
analysis was performed. Analysis of future years is not anticipated to result in different conclusions,
and is not required.
11. In the intersection capacity analysis,a standard peak hour factor(PHF)of 0.92 was still utilized, rather
than the actual PHF present in the collected traffic volumes. However, analysis results are not
anticipated to be significantly affected if the actual PHF was utilized in this case.
ACTION COMMENTS(REQUIRE RESPONSE OR ACTION BY CITY OR APPLICANT)
12. There are two figures labeled Figure 4 on page 3. There are two tables labeled Table 2 in the report.
13. The study recommends that the applicant pursue a variance from the driveway ordinance for the
Driveway 2 (southern driveway). Spacing between the proposed southern driveway and Southlake
Glen Drive appears to be 110 feet, while 200 feet is required along an Arterial. The proposed
driveway will be located at an existing median opening,therefore the request appears reasonable.
14. The study also recommends that the applicant pursue a variance from the required internal
storage/throat length of 100 feet based on anticipated 95" percentile queue lengths of
approximately one vehicle at each driveway. The analysis presented in the study supports the
variance requested.
If you have any questions, please contact me at (972) 248-3006. We appreciate the opportunity to provide
these services and are available to address any additional comments or concerns.
Sincerely,
Digitally signed by John
Denholm III,P.E.
Date:2017.09.21 15:45:14
-05'00'
John Denholm III, P.E., PTOE
Project Manager
Lee Engineering
TBPE Firm F-450
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