<br /> <br /> 26 Slocum TIA April 22, 2025 <br /> INTERSECTION EVALUATION <br />7.1 PERFORMANCE MEASURES <br />Level of Service <br />The City of Eugene uses a Level of Service as a standard for intersections. The Highway <br />Capacity Manual (HCM) defined level of service (LOS) is a concept developed to quantify the <br />degree of comfort (including such elements as travel time, number of stops, total amount of <br />stopped delay, and impediments caused by other vehicles) afforded to drivers as they travel <br />through an intersection or along a roadway segment. It was developed to quantify the quality <br />of service of transportation facilities. <br /> <br />LOS is based on average delay, defined as the average total elapsed time from when a vehicle <br />stops at the end of a queue until the vehicle departs from the stop line. Average delay is <br />measured in seconds per vehicle per hour and is then translated into a grade or “level of <br />service” for each intersection. LOS ranges from A to F, with A indicating the most desirable <br />condition and F indicating the most unsatisfactory condition. The LOS criteria, as defined by <br />the Highway Capacity Manual, for intersections, are provided in Table 7. For this study, the <br />level of service intersection analysis was completed according to the Highway Capacity Manual <br />(HCM) method implemented in SYNCHRO Version 10. <br />• The City of Eugene has a level of service threshold of LOS E for intersections. <br />TABLE 7: HCM LEVEL OF SERVICE FOR INTERSECTIONS <br />Level of Service <br />Stopped Delay per Vehicle <br /> (Seconds per Vehicle) <br />Unsignalized Intersections Signalized Intersections <br />A ≤ 10.0 ≤ 10 <br />B > 10.0 and ≤ 15.0 > 10 and ≤ 20 <br />C > 15.0 and ≤ 25.0 > 20 and ≤ 35 <br />D > 25.0 and ≤ 35.0 > 35 and ≤ 55 <br />E > 35.0 and ≤ 50.0 > 55 and ≤ 80 <br />F > 50.0 > 80 <br /> <br />Volume to Capacity <br />The intersections of Coburg Road at Beltline eastbound and westbound ramps are the <br />jurisdiction of ODOT. ODOT uses a volume-to-capacity ratio (v/c). The v/c ratio is the ratio of <br />actual traffic volumes at the intersection to the maximum volumes the intersection can <br />handle. The Oregon Highway Plan defines the v/c standard for ODOT ramp Terminals as 0.85. <br />However, the City has adopted an alternative v/c standard for the Coburg Road/Beltline ramp <br />terminals of 1.0. <br /> <br />The intersection v/c ratio for ODOT signalized intersection uses the HCM 6 Critical v/c <br />methodology, as required by Chapter 13 of the Analysis Procedures Manual.