Orange County NC Website
Browse       Search
62 <br /> lib <br /> 1.4.2 Intersections <br /> Peak hour LOS measures the adequacy of the intersection geometrics and traffic controls of a particular intersection or <br /> approach for the given turning volumes.LOS ranges from A through F,based on the average control delay experienced <br /> by vehicles traveling through the intersection during the peak hour. Control delay represents the portion of total delay <br /> attributed to traffic control devices(e.g.,signals or stop signs).The engineering profession generally accepts LOS D as an <br /> acceptable operating condition for signalized intersections in urban areas and LOS C for rural areas. <br /> At unsignalized intersections,LOS E is generally considered acceptable only if the side street encounters delay. <br /> Nevertheless,side streets sometimes function at LOS F during peak traffic periods;however,the traffic volumes often do <br /> not warrant a traffic signal to assist side street traffic. Table 11 provides a general description of various LOS categories <br /> and delay ranges. <br /> Table 11: Level of Service Description for Intersections <br /> Level of Service Description Signalized Unsignalized <br /> A Little or no delay <= 10 sec. <= 10 sec. <br /> B Short traffic delay 10-20 sec. 10-15 sec. <br /> C Average traffic delay 20-35 sec. 15-25 sec. <br /> D Long traffic delay 35-55 sec. 25-35 sec. <br /> E Very long traffic delay 55-80 sec. 35-50 sec. <br /> F Unacceptable delay >80 sec. > 50 sec. <br /> Level of Service Analysis <br /> Intersection LOS analyses were performed for the typical weekday AM and PM peak hours using Synchro/SimTraffic <br /> Professional Version 11. The Existing(2022)scenario analysis utilized the existing signal plans from the NCDOT.The <br /> intersection cycle lengths were set per the minimum cycle lengths in the NCDOT Capacity Analysis Guidelines.Peak <br /> hour volumes used in the analysis are from the traffic counts as well as StreetLight,the 5f Street Improvement Project, <br /> and 2019 turning movement counts.The volumes and source for each intersection are shown in Figure 20.A summary of <br /> the findings for the Existing(2022)scenario level of service analysis can be found in Table 9,and the full Synchro/HCS <br /> 60 US 70 Multimodal Corridor Study Existing Conditions Report <br />