Tech Memo #7 - Maricopa County Department of Transportation

Technical Memorandum #7Traffic AnalysisPeoria Avenue Corridor Improvement StudyJackrabbit Trail Parkway to Dysart Road4.0 TRAFFIC ANALYSISMethodologyArterial Street AnalysisTable 2.1 of the MCDOT Roadway Design Manual includes information regarding planning leveltraffic volume thresholds for different facility types. According to this table, a 4-lane urbanarterial can accommodate approximately 35,000 vpd.In addition, planning level analyses were conducted using Highway Capacity Software toestimate volume thresholds for a 4-lane urban arterial roadway. The following assumptions wereutilized in this analysis: 45 mph free-flow speed 60/40 directional split in peak hour 0.95 peak hour factor (PHF) 9% of daily traffic occurs during peak hour Class II street with medians and turn bays 15% turns from exclusive lanes 1 mile segment 3 signals (actuated) Random arrivals (type 3) 90 sec cycle length 0.42 g/c ratioTable 2 shows the resulting daily traffic ranges and corresponding level-of-service thresholds.Table 2 – 4-Lane Arterial LOS ThresholdsThis analysis, along with the MCDOT Roadway Design Manual, generally shows that a 4-lanearterial can accommodate approximately 30,000 vpd. Daily traffic volumes greater thanapproximately 30,000 vpd would warrant a 6-lane arterial.Signal Warrant AnalysisADT Range -Level-of-ArterialService(veh/day)C < 19,000D 19,000 – 31,000E 31,000 – 33,000F > 33,000Signal warrant analyses were conducted in accordance with MCDOT Traffic EngineeringPolicy/Procedure Guideline (PPG), Section 4, Subject 4.6. This guideline sets forth the ADTvolume warrant to be evaluated for future traffic needs on a new intersection, an intersectionrevised by a proposed roadway construction project, or at the driveway of a new commercial orPage 24 January 2011