Appendix D Traffic Impact Analysis - westplainseis.com

2019 (Phase 3) Mitigations:
Hwy 2 / Craig: Install traffic signal and widen/improve intersection approaches to include dual
EB, NB and SB left turn lanes and a 2 nd NB thru lane. Alternatively, consider installation of a
roundabout.
Project Proportional Share: 34.3%
Resulting LOS & Delay (sec): D/52.7 / D/47.4 (roundabout)
Hwy 2 / Lundstrom: Restripe and widen approaches to accommodate exclusive NB and SB right
turn lanes.
Project Proportional Share: 29.4%
Resulting LOS & Delay (sec): F/179.6
Hwy 2 / Garfield: Optimize signal timing.
Project Proportional Share: 23.7%
Resulting LOS & Delay (sec): D/52.5
Hwy 2 / Hayford: Optimize signal timing and consider converting the inside SB thru land to a
2 nd SB left turn lane. Widen the EB and NB approaches for exclusive right turn lanes. Restripe
the wide paved median for a 2 nd WB left turn lane. Add 2 nd NB left turn lane. Alternatively, add
a 2 nd NB left turn lane and a WB auxiliary lane.
Project Proportional Share: 18.0%
Resulting LOS & Delay (sec): F/97.1 / D/51.3 (alternative)
Craig / SR 902: Install traffic signal or consider installation of a roundabout.
Project Proportional Share: 31.1%
Resulting LOS & Delay (sec): B/17.6 / B/10.4 (roundabout)
Hwy 2 / Middle Driveway: Install traffic signal and approach improvements (SB Middle
Driveway); install a WB right turn lane. Alternatively, consider installation of a roundabout.
Project Proportional Share: 100%
Resulting LOS & Delay (sec): D/45.4 / E/61.3 (roundabout
Craig / Sixth Ave.: Widen the intersection approach to provide and exclusive NB right turn lane.
Project Proportional Share: 38.0%
Resulting LOS & Delay (sec): D/28.8
Note, a failing LOS was identified at the unsignalized intersection of Hwy 2 / Lundstrom under Phase 2
and Phase 3 development conditions. Minor improvements (turn lanes are noted above and in Table 16;
if delays persist at this intersection it is likely that traffic will shift and redistribute to other nearby arterial
intersections at Hwy 2 / Craig Rd. and Hwy 2 / Lawson St., The minor volume shift is not expected to
have an appreciable impact on LOS at the nearby arterial intersections.
Regarding congestion at Hwy 2/Hayford, it is worth noting that development of an alternative east/west
route through Airway Heights along the alignment of 21 st Ave. is under consideration by the City of
Airway Heights, WSDOT Spokane County and the City of Spokane. The intent of this alternative route
is to reduce through volumes on HWY 2 on the West Plains. Our analysis indicates that an acceptable
LOS at Hayford (without a third WB lane) could be achieved with a reduction in east/west through
volumes of approximately 19% with said reduced volume shifting to the new 21 st Ave. route. Note, that
at the time of publishing this report the 21 st Ave. project has not been officially adopted by the agencies
involved or added to the regional transportation improvement plan list of projects. If the 21 st Ave. bypass
is accepted and adopted by the impacted agencies (WSDOT, City of Airway Heights, Spokane
County and City of Spokane) the Spokane Tribe West Plains project could consider make a fair share
contribution to the 21 st Ave. project in lieu of improvements at Hwy 2/Hayford.
West Plains Development – Spokane Tribe Page | 66
Traffic Impact Analysis April 28, 2011