PZ - ITD Traffic Impact Study
IDAHO TRANSPORTATION DEPARTMENT
P.O. Box 8028 • Boise, ID 83707-2028
(208) 334-8300 • itd.idaho.gov
October 18, 2017
Kittelson & Associates, Inc.
Attn: Andy Daleiden, P.E.
101 South Capitol Blvd, Suite 301
Boise, Idaho 83702
Via Email
Dear Mr. Daleiden,
The Idaho Transportation Department (ITD) has reviewed the submitted Traffic Impact Study (TIS) dated September
2017 for the Ten Mile Development located at the southwest corner of US 20/26 (Chinden Blvd) and Ten Mile Road.
ITD appreciates receiving the analysis of multiple scenarios; however we do take exception to the references in the TIS
and in Figure A that improvements needed to mitigate present day conditions is an immediate agency responsibility.
ITD acknowledges current and future widening needs in the US 20/26 corridor plan and are committed to resolving
them as funding is available. We presently do not have a project programmed to address widening on Chinden Blvd
between Linder Road and Tree Farm Way. Funding is not currently available for this section, we are working to fund
the corridor, prioritizing based on highest traffic volumes, with current projects funded between Eagle Rd and Locust
Grove and Locust Grove to Linder Rd. The improvements outlined in the TIS and as further clarified below, are required
to address additional impacts of the proposed development and, without a funded project, are the responsibility of the
development.
Please find our comments below regarding site access and improvements needed per the TIS.
Site Access A:
• ITD will allow a temporary right-in/right-out/left-in at Site Access A located 1160ft west of Ten Mile
Road until Chinden Blvd is widened to three lanes in the eastbound direction. At that time the
movement will be limited to right-in/right-out. The left-in movement may also be restricted prior if
there are safety concerns.
• The left-in movement will require a left turn lane that shall be designed per Figure 3B-2 in the ITD
Traffic Manual.
• A 550ft right deceleration lane is required and shall be designed per Figure 3B-4 in the ITD Traffic
Manual. Per the standard the deceleration length (370ft) plus the taper (180ft) shall be 550ft.
IDAHO TRANSPORTATION DEPARTMENT
P.O. Box 8028 • Boise, ID 83707-2028
(208) 334-8300 • itd.idaho.gov
Site Access B:
• The City of Meridian will annex in this development changing the access area type from statewide rural
to urban > 35MPH resulting in a required upstream driveway spacing of 790ft from the signal and
distance between driveways of 500ft. The access spacing does not meet IDAPA minimum requirements
of 790ft; however, to not allow the right in at Site B will result in an additional 83 eastbound rights at
the Ten Mile Rd and Chinden Blvd intersection in 2024 which is already handling 341 right turns during
the Saturday peak hour. Therefore, ITD will allow a variance to the IDAPA minimum spacing
requirements and allow the right-in/right-out at Site Access B located 545ft east of Site Access A and
615ft west of Ten Mile Road.
• Right deceleration shall be per Figure 3B-4 in the ITD Traffic Manual. The deceleration length plus the
taper should be 550ft. Due to the distance restriction between Access A and Access B (545ft) ITD may
allow for a 10% decrease of the standard 550ft. requirement.
ITD requires the following improvements be made as identified in the TIS:
Chinden Blvd:
• Chinden Blvd will be widened to a four lane section between Tree Farm Way and Linder Road as
proposed in the TIS and include a concrete median island. The final road section design and layout will
be approved by ITD.
• Widening to include construction west of Tree Farm Way to taper the pavement back to a three lane
section.
• Install conduit with fiber optics the entire length of the widening.
Intersection of Black Cat Rd and Chinden Blvd:
• A signal shall be installed to ACHD requirements. The signal poles need to be located as such to
accommodate future widening on Black Cat Rd as identified in the US 20/26 Corridor Plan.
• The new signal at Black Cat Rd must be interconnected with the signals at Tree Farm Way and SH-16.
• ITD is aware that the northbound right and south bound left turning movements off of Black Cat Rd fail
in the 2024 TOTAL PM Peak hours. ITD awaits comments from ACHD on how they would like to
address this concern.
IDAHO TRANSPORTATION DEPARTMENT
P.O. Box 8028 • Boise, ID 83707-2028
(208) 334-8300 • itd.idaho.gov
Intersection of Ten Mile and Chinden Blvd:
• Install additional eastbound thru lane and westbound thru lane as part of the overall Chinden Blvd
widening. Eastbound lane configurations on Chinden Blvd will include two thru lanes, one left turn lane
and a dedicated right turn lane.
• Install additional westbound left turn lane. Westbound lane configurations on Chinden Blvd will
include one combined thru/right turn lane, one thru lane and two left turn lanes.
The Ten Mile Commercial Development may enter into a STAR agreement with ITD to implement all of the work
outlined in the preceding bullets in addition to widening Chinden Blvd from Tree Farm Way to the termination of ITD's
completed SH-16 project. ITD reserves the right during the STAR agreement negotiations to request additional
improvements.
ITD would like to state that US 20/26 and its corridor is a vital east-west commuter route in this region. The
department appreciates the economic opportunities the Ten Mile Development brings to the City of Meridian, but
must balance that with maintaining mobility along the corridor.
If the applicant is in agreement with addressing the items as outlined above then this TIS is acceptable from a state
highway access, safety and mobility standpoint. You may proceed with stamped engineered drawings of your
proposed access and safety improvements. Final approval of the accesses is determined once all documentation has
been provided and the permit is signed.
Maintaining safety and mobility for Idaho's motorists is of the utmost importance to ITD. Please let me know if you
have any questions. I can be reached by phone at (208) 334-8340 or email at erika.bowen@itd.idaho.gov
Sincerely,
Erika R. Bowen, P.E.
District 3 Traffic Engineer
cc. Mindy Wallace ACHD
Caleb Hood City of Meridian
Amy Revis ITD
Chinden & Ten Mile Mixed -Use Development
MAW
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Install Two -Way Left -Turn Lane
Install Eastbound Right -Turn Lane
Interim (2 Lanes - Chinden) "Full'
Long -Term (4 Lanes - Chinden) "RIRO/Ll'
Install Eastbound Right -Turn Lane
"RIRO"
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KITTELSON
& ASSOCIATES
IwoWr
Proposed Improvements Figure
Meridian, Idaho A
Required Improvements for Existing/Background Conditions (Agency Responsibility)
Required Improvements for the Linder Village Development Signal Timing
New Signals
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-A-- Stop Sign Full = Full Movement
s Southbound right -turn lane RIRO = Right-In/Right-Out
Required Improvements by Phase 1 (Costco)
Adjustment
may be needed in the future
Required Improvements for Phase 2 (Full Buildout)
with other developments LI =Left -In
KITTELSON
& ASSOCIATES
IwoWr
Proposed Improvements Figure
Meridian, Idaho A