Item 7C - Applicant's Response to Lee Engineering TIA Review #1Southlake Coffee Responses
The study assumed that half of the entering vehicles would use the drive -through and half would
park, based on the ITE pass -by rate of 49% in the AM peak hour for Fast -Food Restaurant with
Drive -Through Window (ITE Land Use 934). Therefore, the assumed arrival rate was 47 vehicles
per hour.
It is unclear why pass -by percentage was utilized to estimate the number of vehicles
entering the drive -through, as the two do not appear to be related.
It is reasonable to assume that there is high correlation between pass -by vehicles and
drive -through usage. In the absence of any drive -through vs. dine -in data from ITE,
reviewing agencies accept pass -by trips as drive -through trips when determining
queue requirements.
Based on experience, we believe it likely that a higher percentage would enter the
drive -through.]
There is no data provided by ITE. Any assumption that the percentage would be
higher is just an assumption. The percentage used in the analysis used the closest
approximate available data for the land use.
Please provide additional data or description supporting the assumption that only 50%
of entering traffic will utilize the drive -through
In the absence of any drive -through vs. dine -in data from ITE, reviewing agencies
accept pass -by trips as drive -through trips when determining queue requirements. ITE
does not provide pass -by trip percentages for coffee shops, so this analysis used fast-
food restaurant pass -by as the closest approximation for which we have data.
The study assumed an average service time of one minute (60 seconds) for ordering and
receiving an order, based on the assumption that vehicles exit the drive -through and park for
orders that take longer than one minute.
It is unclear if vehicles would be expected to exit the drive -through to wait for coffee in
this manner based on observations of other coffee shops with drive -through
windows. Similar operation has been observed for fast-food restaurants, however.
Scooter's Coffee has recently prepared a study where the average time at the order
window was 24 seconds, and the average time at the pickup window was 32 seconds.
Based on the above assumptions, it is unclear if the predicted average and 95t" percentile
queue lengths are accurate.
The study does include any additional analysis elements. Based on the City of Southlake
Driveway Ordinance, "existing driveways that are not in conformance with this ordinance shall
be brought into compliance" if the existing driveway volume is projected to increase by 20%
or more during the design hour. For reference, estimated existing and proposed trip
generation for the redeveloped site is shown in the following table, along with the percent
change.
Based on preliminary trip generation, it is likely that AM peak hour site traffic will
increase with the redevelopment. Trip generation should be provided comparing
existing trips and projected trips to determine whether traffic at each driveway is
predicted to increase more than 20%.
The table below shows existing and proposed trips.
The site results in more trips in the AM peak hour but fewer trips in the PM peak hour.
Additionally, traffic may also increase at the southern driveway in general. Currently,
this driveway terminates at the existing automated car wash. With the redevelopment,
this driveway will provide direct access to the rest of the shopping center. All three
driveways on FM 1709 are right-in/right-out and this is the first driveway encountered
by drivers.
The center driveway is expected to continue to serve as the main entrance for the retail area. This
driveway would primarily serve the coffee shop.