Item 6 - Lee Engineering Review of Traffic Memo
ARIZONA
TEXAS
NEW MEXICO
OKLAHOMA
3030 LBJ Freeway, Suite 1660, Dallas, TX 75234
(972) 248-3006 office (972) 248-3855 fax | www.leeengineering.com Page 1 of 2
October 14, 2021
Jeff Ginn, P.E.
Development Engineer
City of Southlake
1400 Main Street, Suite 320
Southlake, Texas 76092
Re: HTeaO, 190 Davis Blvd Review #2
Dear Mr. Ginn:
Per City request, we have completed a second review of the HTeaO Traffic Memorandum and Traffic Control
Plan contained in the memorandum dated 9/30/2021.
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 site is predicted to generate 172 trips (76 entering, 76 exiting) during the sites peak hour (3:00
PM to 4:00 PM). This is based on transaction data from two other metroplex area stores. Transaction
data was the appropriate source of trip generation due to the uniqueness of the use and agreed to
during the scoping meeting between the applicant and the City prior to the study. The transaction
data indicates that 73% of site traffic is drive-thru vs. 27% in-store.
2. The traffic analysis provided focuses on the 3:00 PM to 5:00 PM period, with a peak hour of 3:00 to
4:00 PM identified based on it being the peak hour of the HTeaO transaction data, and the peak 60
minute period within the two hour count window along Davis Boulevard. No AM peak hour analysis
was requested by the City as the transaction data indicates a low number of trips during those hours.
3. The analysis was revised to address comments from Review #1. No further revision of the study is
necessary at this time.
4. The traffic analysis indicates that the eastbound left turn out of the site is a difficult movement.
The existing driveway, serving Sonic only, has an eastbound approach Level of Service of F.
Once site traffic for the HTeaO is added to the driveway, the eastbound driveway approach
is projected to remain at Level of Service F. Eastbound left turns from the driveway will likely
experience lengthy delays, while eastbound right-turns from the site are predicted to
operate at Level of Service C.
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As difficulty making the eastbound left turn from the driveway increases, traffic exiting the
site will choose to make right-turns and make a u-turn downstream or take a different route
to their destination instead.
The applicant has taken the following steps to mitigate the effects of the left-turn delay:
i. The traffic control plan for the site shows two exit lanes on the driveway to allow for
a left turn only and a right turn only lane exiting the site. This will allow right-turns
out of the site even when a left-turning motorist is queued.
ii. The traffic control plan shows Do Not Block Driveway signage and markings internal
to the site and attempts to assure that inbound traffic is not impeded by queued
vehicles waiting to exit the site.
No Action Comments resulted from this review.
Sincerely,
John Denholm III, P.E., PTOE
Senior Project Manager
Lee Engineering
TBPE Firm F-450