Appendix D Traffic Impact Analysis - westplainseis.com

Resulting LOS & Delay (sec): D/49.4
Hwy 2 / Hayford: Convert the inside SB thru lane to a 2 nd SB left turn lane.
Project Proportional Share: 9.3%
Resulting LOS & Delay (sec): F/141.4
Craig / SR 902: Install traffic signal or consider installation of a roundabout.
Project Proportional Share: 17.4%
Resulting LOS & Delay (sec): B/17.2 / B/10.7 (roundabout)
Hwy 2 / Fairchild AFB: Modify signal timing. Add NB left turn lane and WB thru lane.
Project Proportional Share: 6.9%
Resulting LOS & Delay (sec): D /48.9
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/40.3 / E/60.0 (roundabout)
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. 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. by-pass 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 | 86
Traffic Impact Analysis April 28, 2011