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TABLE 3-1 <br />LEVEL OF SERVICE CRITERIA FOR SIGNALIZED INTERSECTIONS (ICU METHODOLOGY) <br />Level of Service <br />(LOS) <br />Intersection Capacity <br />Utilization Value (V/C) <br />Level of Service Description <br />EXCELLENT. No vehicle waits longer <br />A <br /><_ 0.60 <br />than one red light, and no approach phase is <br />fully used. <br />VERY GOOD. An occasional approach <br />B <br />0.61 — 0.70 <br />phase is fully utilized; many drivers begin <br />to feel somewhat restricted within groups <br />of vehicles. <br />GOOD. Occasionally drivers may have to <br />C <br />0.71 — 0.80 <br />wait through more than one red light; <br />backups may develop behind turning <br />vehicles. <br />FAIR. Delays may be substantial during <br />portions of the rush hours, but enough <br />D <br />0.81 — 0.90 <br />lower volume periods occur to permit <br />clearing of developing lines, preventing <br />excessive backups. <br />POOR. Represents the most vehicles <br />E <br />0.91 — 1.00 <br />intersection approaches can accommodate; <br />may be long lines of waiting vehicles <br />through several signal cycles. <br />FAILURE. Backups from nearby locations <br />or on cross streets may restrict or prevent <br />F <br />> 1.00 <br />movement of vehicles out of the <br />intersection approaches. Potentially very <br />long delays with continuously increasing <br />queue lengths. <br />