CC - Horrocks Response to ACHD Comment2162 W. Grove Parkway, Suite 400 Tel: 801.763.5100
Pleasant Grove, UT 84062 1 Fax: 801.763.5101
To: Mindy Wallace
ACHD
From: John Dorny, P.E.
Principal
Date: April 27, 2016
Subject: St. Ignatius Elementary School Traffic Impact Study Comments Response
This memo will address the comments received from ACHD regarding the St. Ignatius Elementary School
Traffic Impact Study.
1. The intersection capacity analysis shown in in the study did not include the intersection level of service by
lane group. The study should be revised to provide this information and resubmitted to staff for review.
The report has been updated to show level of service by lane group
2. The existing conditions analysis did not review crash history, as required by District policy 7106.8.3. Please
provide a crash analysis for the intersections and roadway segment included in the study for staff’s review.
Crash data for the Chinden Boulevard/Meridian Road intersection as well as the nearby segments of
Chinden Boulevard and Meridian Road were obtained from ITD. A summary of the data and a brief analysis
were added to the report. There were no fatalities and a majority of the crashes are rear-end crashes
related to intersection traffic.
3. Staff questions the traffic volumes shown on Figure 17. How is the traffic volume only increasing by
approximately 10 vehicles on Meridian Road in the AM peak hour? Please review and submit any
modifications to staff for review.
The volumes shown in Figure 17 have been changed to reflect the volumes that were used in the Vistro
modeling. The volumes in the Vistro models were correct and did not need to be changed, so the delay
and LOS remain unchanged. This was as graphic error not an analysis error.
4. The proposed driveway on Meridian Road does not currently have a left turn lane or center land lane as
stated on page 29 of the study. Please provide the left turn lane analysis and submit the information to
staff for review.
The reported existing left turn lane was adjusted and a left-turn lane warrant analysis was performed for
the proposed driveway on Meridian Road. No turn-lane is warranted.
2162 W. Grove Parkway, Suite 400 Tel: 801.763.5100
Pleasant Grove, UT 84062 2 Fax: 801.763.5101
5. It is unclear to staff how the proposed student drop-off/pick-up area is going to work. Is the length of the
drop-off adequate for the proposed queues? Do pedestrians have to cross the drop-off/pick-up area? Is
there adequate parking/stacking during pick-up?
The onsite drop-off/pick-up lane consists of a primary lane (green on attached exhibit) and a secondary
lane (yellow on attached exhibit). The primary drop off lane is approximately 425-feet in length and the
secondary drop off lane is approximately 405-feet in length. Both lanes consist of a designated lane
adjacent to a concrete sidewalk for drop off of students from the passenger side of the vehicle as well as
a bypass lane that allows unloaded cars to pull out and proceed to exit. We anticipate the ability to queue
in excess of 44 cars in the drop off lanes. The parking lot to the north of the lanes contains approximately
300 parking stalls with a connected sidewalk allowing additional drop off capability.
Several studies have developed curb drop-off/pick-up capacity as a function of enrollment. A North
Carolina Department of Transportation Study estimates a minimum queue length of about 1.65-feet per
student while the South Carolina Department of Transportation has developed a guideline of about 2-feet
per student and the Texas Transportation Institute recommends 1.5-feet per student. The St. Ignatius
School site, as currently designed, provides approximately 1.84-feet per student in the designated drop-
off/pick-up lanes (830-feet total) with an additional 240-feet of internal driveway west of the drop-
off/pick-up lanes. The result is a total queue length of 1,070-feet or approximately 2.38-feet per student
exceeding known recommendations and guidelines.
6. Figure 14 on page 23 shows a gap in the sidewalk (across an out parcel) on Meridian Road. It would be
beneficial to have a sidewalk constructed across the out parcel; it appears that the out parcel is owned by
the applicant.
The applicant agrees that this walk connection could be beneficial as the adjacent parcel of land also
develops and will investigate the feasibility of adding this to the project.