Appendix D Traffic Impact Analysis - westplainseis.com

Hwy 2 / Fairchild AFB: Modify signal timing. Add a 2 nd NB right turn lane.
Project Proportional Share: 11.6%
Resulting LOS & Delay (sec): D/51.6
Craig Rd./Sixth Ave.: Consider installation of a roundabout in lieu of mitigation identified for
2019 condition.
Project Proportional Share: 33.5%
Resulting LOS & Delay (sec): C/20.5
Craig / North Driveway.: Consider adding a 2 nd NB thru lane. If this improvement is chosen it
is recommended that the 2 nd NB thru lane be continuous from Highway 2 to 6 th Ave.
Alternatively, consider installation of a roundabout which would also achieve a satisfactory level
of service.
Project Proportional Share: 100%
Resulting LOS & Delay (sec): E.37.3 / B/11.4 (roundabout)
HWY 2/West Site Access: Add a 4 th , southerly leg to the intersection to extend and connect to
21 St Ave.
Resulting LOS & Delay (sec): D/53.2
HWY 2/Craig Rd.: Modify northbound and southbound approaches to provide dual left turn
capability.
Resulting LOS & Delay (sec): D/54.4
2032 Alternative 2 Mitigations (in addition to Alt. 2 2012 mitigations above):
In lieu of constructing the mitigations identified in the TIA at the Lundstrom, Lawson, Garfield
intersections along HWY 2 is recommend that the project contribute a proportional share to
improvements to the 21 st Ave. alternative route which will relieve traffic from the HWY 2 corridor
and likely eliminate the need for improvements to the Lundstrom, Lawson and Garfield intersections.
Craig / Sixth Ave.: Widen the intersection approach to provide and exclusive NB right turn lane.
Project Proportional Share: 25.6%
Hwy 2 / Fairchild AFB: Modify signal timing. Add a 2 nd NB right turn lane.
Project Proportional Share: 11.6%
Resulting LOS & Delay (sec): D/44.8
HWY 2/West Site Access: Add a 4 th , southerly leg to the intersection to extend and connect to
21 St Ave.
Resulting LOS & Delay (sec): D/37.9
2032 Alternative 3 Mitigations (in addition to Alt. 3 mitigations above):
In lieu of constructing the mitigations identified in the TIA at the Lundstrom, Lawson, Garfield
intersections along HWY 2 is recommend that the project contribute a proportional share to
improvements to the 21 st Ave. alternative route which will relieve traffic from the HWY 2 corridor
and likely eliminate the need for improvements to the Lundstrom, Lawson and Garfield intersections.
Hwy 2 / Fairchild AFB: Modify signal timing. Add a 2 nd NB right turn lane.
Project Proportional Share: 11.6%
Resulting LOS & Delay (sec): D/42.7
HWY 2/West Site Access: Add a 4 th , southerly leg to the intersection to extend and connect to
21 St Ave.
Resulting LOS & Delay (sec): D/33.9
West Plains Development – Spokane Tribe Page | 8
Traffic Impact Analysis Addendum July 18, 2011