Appendix D Traffic Impact Analysis - westplainseis.com

2032 Alternative 2 Mitigations (in addition to Alt. 2 2012 mitigations above):
Hwy 2 / Lundstrom: Restripe and widen approaches to accommodate exclusive NB and SB right
turn lanes. Consider restricting NB/SB left turns and adding EB/WB right turn lanes.
Project Proportional Share: 18.9%
Resulting LOS & Delay (sec): D/34.1
Hwy 2 / Lawson: Modify the signal timing. Add EB/WB right turn lanes, reconfigure N/S
approaches.
Project Proportional Share: 18.6%
Resulting LOS & Delay (sec): D/37.4
Hwy 2 / Garfield: Optimize signal timing. Add EB right turn lane, add separate NB left turn lane,
reconfigure SB approach.
Project Proportional Share: 14.8%
Resulting LOS & Delay (sec): E/57.2
Craig / Sixth Ave.: Widen the intersection approach to provide and exclusive NB right turn lane.
Project Proportional Share: 25.6%
Resulting LOS & Delay (sec): D/28.5
Hwy 2 / Fairchild AFB: Modify signal timing. Add NB left turn lane and WB thru lane.
Project Proportional Share: 8.2%
Resulting LOS & Delay (sec): D/50.6
2032 Alternative 3 Mitigations (in addition to Alt. 3 mitigations above):
Hwy 2 / Lundstrom: Restripe and widen approaches to accommodate exclusive NB and SB right
turn lanes. Consider restricting NB/SB left turns and adding EB/WB right turn lanes.
Project Proportional Share: 16.3%
Resulting LOS & Delay (sec): D/32.4
Hwy 2 / Lawson: Modify the signal timing. Reconfigure N/S approaches.
Project Proportional Share: 16.0%
Resulting LOS & Delay (sec): D/37.0
Hwy 2 / Garfield: Optimize signal timing. Add EB right turn lane, add separate NB left turn lane,
reconfigure SB approach.
Project Proportional Share: 12.7%
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
Operational analysis results for all three alternatives for the improvements identified above are
summarized in the ‘mitigation’ tables included at the end of this Executive Summary.
General Recommendations Applying to All Project Alternatives
Roadway frontage improvements and driveway approaches including curb & gutter and sidewalks or
shared use pathways should be constructed along the site frontages and should comply with current
West Plains Development – Spokane Tribe Page | 8
Traffic Impact Analysis April 28, 2011