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V/C of 0.01.1 For unsignalized intersections, the City of Santa <br />Ana does not specifically define significance criteria. <br />Signalized Intersections- Intersection Capacity Utilization <br />(ICU)Methodology <br />In accordance with the City of Santa Ana and the County of <br />Orange Congestion Management Program (CMP) requirements, peak <br />hour operating conditions at the signalized intersections were <br />evaluated using the Intersection Capacity Utilization (ICU) <br />methodology. The ICU methodology provides a comparison of the <br />theoretical hourly vehicular capacity of an intersection to the <br />number of vehicles actually passing through that intersection <br />during a given hour. <br />The ICU calculation generates a volume-to-capacity (V/C) ratio <br />that translates into a corresponding Level of Service (LOS) <br />measure, ranging from LOS "A", representing uncongested, free- <br />flowing conditions, to LOS "F", representing over-capacity <br />conditions. A summary description of each Level of Service and <br />the corresponding V/C ratio is provided on the following chart: <br />LEVEL OF SERVICE DESCRIPTIONS <br />SIGNALIZED INTERSECTIONS <br />Level of ICU Value Description <br />Service <br />A 0.00 - 0.60 EXCELLENT - No vehicle waits longer than one red light and no approach phase <br /> is full used. <br />B 0.61 - 0.70 VERY GOOD - An occasional approach phase is fully utilized; many drivers begin <br /> to feel somewhat restricted within ou s of vehicles. <br />C 0.71 - 0.80 GOOD - Occasionally drivers may have to wait through more than one red light; <br /> back-u s ma develo behind tumin vehicles <br /> FAIR - Delays may be substantial during portions of the rush hours, but enough <br />D 0.81 - 0.90 lower volume periods occur to permit clearing of developing lines, preventing <br /> excessive back-u s. <br />E 0.91 - 1.00 POOR - Represents the most vehicles that the intersection approaches can <br /> accommodate; ma be lon lines of waiin vehicles throu h several si al c cles. <br /> FAILURE - Back-ups from nearby locations or on cross streets may restrict or <br />F > 1.00 prevent movement of vehicles out of the intersection approaches. Tremendous <br /> dela s with continuousl increasin ueue len hs. <br />The following intersections will be analyzed using the ICU <br />methodology: <br />• Grand Avenue and Warner Avenue <br />• Grand Avenue and Brookhollow Drive <br />• Grand Avenue and Dyer Road <br />• Dyer Road and Main Street <br />1 City of Santa Ana. <br />29 <br />7~r~~9 <br />