Appendix D Traffic Impact Analysis - westplainseis.com

6.1.4 ALTERNATIVE 1 – MITIGATION
This section identifies mitigation improvements for Alternative 1 conditions. Proposed mitigations options are
identified in the table below in bold with the corresponding operational analysis results by phase of development.
Intersection locations with acceptable LOS are not included in the table.
Table 16. Mitigation Operational Analysis Results-Alternative 1
INTERSECTION
2012 PM Peak
BG + Alt1-Ph1
2015 PM Peak
BG + Alt1-Ph2
2019 PM Peak
BG + Alt1-Ph3
2032 PM Peak
BG + Alt1-Ph3
Hwy. 2 / CM = NBLTR CM = SBLTR CM = SBLTR CM = SBLTR
Craig Rd. LOS = F LOS = F LOS = F LOS = F
Delay = * Delay = * Delay = * Delay = *
Signalized
Add Dual EB, NB, SB Lt. turn lanes and
NB through lane
Roundabout
LOS = C LOS = D LOS = F
Delay = 31.6 Delay = 44.7 Delay = 121.8
-- --
LOS = D LOS = F
Delay = 52.7 Delay = 101.5
LOS = A LOS = B LOS = D LOS = F
Delay = 7.8 Delay = 12.4 Delay = 47.4 Delay = 94.9
Hwy. 2 / CM = NBLTR CM = NBLTR CM = NBLTR CM = NBLTR
Lundstrom St. LOS = E LOS = F LOS = F LOS = F
Delay = 46.3 Delay = 76.6 Delay = 217.2 Delay = *
NB/SB Right turn lanes
Add EB/WB Right turn bays,
eliminate N/S left turns
CM = NBLT R CM = NBLT R CM = NBLTR
-- LOS = F LOS = F LOS = F
Delay = 63.3 Delay = 179.6 Delay = *
-- -- --
West Plains Development – Spokane Tribe Page | 63
Traffic Impact Analysis April 28, 2011
--
CM = NBR
LOS = E
Delay = 42.3
Hwy. 2 /
-- -- --
LOS = F
Lawson St. Delay = 89.1
Modify Signal Timing/Phasing, Add NB &
SB Lt. turn bays
-- -- --
LOS = D
Delay = 40.6
Hwy. 2 /
-- --
LOS = E LOS = F
Garfield St. Delay = 69.2 Delay = 160.9
Optimized Signal Timing
(NB/SB Left turn lanes)
Modify Signal Timing/Phasing, Add EB &
WB Auxilliary Lanes
-- --
LOS = D
-- -- --
LOS = F
Delay = 52.5 Delay = 131.5
LOS = C
Delay = 25.0
Hwy. 2 / LOS = E LOS = E LOS = F LOS = F
Hayford Rd. Delay = 59.8 Delay = 80.0 Delay = 140.9 Delay = 243.7
Optimized Signal Timing, Add SB Lt. Turn
Lane
Add WB Lt. turn bay; Add NB & EB Rt.
Turn Lanes
LOS = D LOS = E -- --
Delay = 45.9 Delay = 60.4
-- LOS = D LOS = F --
Delay = 54.0 Delay = 97.1
Add NB Lt. turn bay, WB auxilliary lane -- -- LOS = D LOS = F
Delay = 51.3 Delay = 95.4