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HARBOR BLVD. MIXED USE TRANSIT CORRIDOR PLAN FINAL FIR
<br />CITY OF SANTA ANA
<br />5. Environmental Analysis
<br />TRANSPORTATION AND TRAFFIC
<br />Table 5.13 -2 Maximum Averaqe Dailv Traffic and LOS for Arterial Roads
<br />Soumz: IBI 2013.
<br />Intersection Level of Service
<br />Traffic conditions at signalized intersections are evaluated using the Intersection Capacity Utilization (ICq
<br />methodology consistent with the City of Santa Ana traffic analysis procedures. The ICU methodology is
<br />based on intersection V/C ratios. The V/C value for each movement is the observed or forecast volume
<br />divided by the saturation flow volume. The intersection ICU value is the sum of the V/C values for the
<br />critical movement on each leg, where critical movements are the pairs of conflicting movements with the
<br />highest combined V/C values. ICU is usually expressed as a decimal value (e.g., 0.74), and 1.00 represents the
<br />saturated condition where the volume of traffic flow is equal to the capacity. The V/C ratios for each LOS
<br />grade are presented above in Table 5.13 -1. Consistent with City of Santa Ana guidelines, this study uses
<br />maximum saturation volumes of 1,600 vehicles per hour per lane (VPHPL) for turn lanes and 1,700 VPHPL
<br />for through lanes for the study intersection analysis.
<br />All freeway ramp termini intersections are evaluated using the Highway Capacity Manual 2000 (HCM 2000)
<br />operations methodology consistent with Caltrans guidelines. The operations methodology for signalized
<br />intersections evaluates LOS based on delay per vehicle. Consistent with HCM 2000 methodology, the
<br />maximum saturation flow rate for intersections analyzed using HCM 2000 is 1,900 VPHPL. The relationship
<br />between controlled delay per vehicle and LOS for signalized intersections is summarized in Table 5.13 -3.
<br />October 2014 Page 5.13 -3
<br />Lane
<br />Street Classification
<br />Configuration
<br />A
<br />B
<br />C
<br />D
<br />E
<br />F
<br />Principal Arterial
<br />8 Lanes
<br />85,000
<br />52,500
<br />60,000
<br />67,500
<br />75,000
<br />>75,000
<br />Divided
<br />Major Arterial
<br />6 Lanes
<br />33,900
<br />39,400
<br />45,000
<br />50,600
<br />56,300
<br />>56,300
<br />Divided
<br />Primary Arterial
<br />4 Lanes
<br />22,500
<br />26,300
<br />30,000
<br />33,800
<br />37,500
<br />>37,500
<br />Divided
<br />Secondary Arterial
<br />4 Lanes
<br />15,000
<br />17,500
<br />20,000
<br />22,500
<br />25,000
<br />>25,000
<br />Undivided
<br />Divided Collector
<br />2lanes
<br />9,000
<br />12,000
<br />15,000
<br />20,000
<br />22,000
<br />>22,000
<br />Arterial
<br />Divided
<br />Commuter Street
<br />2Lanes
<br />7,500
<br />8,800
<br />10,000
<br />11,300
<br />12,500
<br />>12,500
<br />Undivided
<br />Soumz: IBI 2013.
<br />Intersection Level of Service
<br />Traffic conditions at signalized intersections are evaluated using the Intersection Capacity Utilization (ICq
<br />methodology consistent with the City of Santa Ana traffic analysis procedures. The ICU methodology is
<br />based on intersection V/C ratios. The V/C value for each movement is the observed or forecast volume
<br />divided by the saturation flow volume. The intersection ICU value is the sum of the V/C values for the
<br />critical movement on each leg, where critical movements are the pairs of conflicting movements with the
<br />highest combined V/C values. ICU is usually expressed as a decimal value (e.g., 0.74), and 1.00 represents the
<br />saturated condition where the volume of traffic flow is equal to the capacity. The V/C ratios for each LOS
<br />grade are presented above in Table 5.13 -1. Consistent with City of Santa Ana guidelines, this study uses
<br />maximum saturation volumes of 1,600 vehicles per hour per lane (VPHPL) for turn lanes and 1,700 VPHPL
<br />for through lanes for the study intersection analysis.
<br />All freeway ramp termini intersections are evaluated using the Highway Capacity Manual 2000 (HCM 2000)
<br />operations methodology consistent with Caltrans guidelines. The operations methodology for signalized
<br />intersections evaluates LOS based on delay per vehicle. Consistent with HCM 2000 methodology, the
<br />maximum saturation flow rate for intersections analyzed using HCM 2000 is 1,900 VPHPL. The relationship
<br />between controlled delay per vehicle and LOS for signalized intersections is summarized in Table 5.13 -3.
<br />October 2014 Page 5.13 -3
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