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Year
2030 projected levels of service : intersections
"Level
of Service" (LOS) for intersections is based on
average "control delay" time for peak hour trips through
a given intersection. LOS grades are similar to school grades: A
is excellent and F is failing.
According
to the 2004 Draft EIR,
the bridge would not result in a sufficient improvement in service
level to justify it as a stand-alone project. Genesee widening would
result in an acceptable level of service on virtually all road segments
in the study area. The underpass (grade separation) is projected
to result in poor segment LOS.
Another
figure of merit used to assess the sufficiency of existing or proposed
capacity is road segment level
of service, which is based on average daily trips (ADTs)
and roadway capacity (i.e. number of lanes) for a given segment.
Segment LOS is a less useful measure than intersection LOS, however,
since intersection operation is largely what controls the flow of
traffic along a corridor during peak hour.
Our
point system: The base 2030 "no project" service levels
are assigned a combined score of zero. Alternatives score 0.5 points
for each half-grade of service level improvement up to a maximum
of 2.5 points. Thus, improvement from F to D is worth 2 points,from
F to anything better than D is 2.5 points. For example, for the
twelve intersections listed below (AM and PM peaks counted separately),
the Genesee widening alternative scores -0.5 (DE to E), 0.0 (E to
E), 1.0 (E to D), 0.0 (E to E), 1.5 (F to DE), 1.5 (F to DE), 1
(F to E), 0.0 (BC to A), 0.0 (F to F), 1.0 (F to E), 0.0 (E to E),
and 0.0 (F to F) for a total of 5.5 points.
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