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Table E-1 <br /> Level of Service Definitions (Signalized Intersections) <br /> Level of Service Traffic Flow Characteristics <br /> A Very low average stopped delay, less than five seconds per vehicle. This <br /> occurs when progression is extremely favorable,and most vehicles arrive <br /> during the green phase. Most vehicles do not stop at all. Short cycle lengths <br /> may also contribute to low delay. <br /> B Average stop delay is in the range of 5.1 to 15.0 seconds per vehicle. This <br /> generally occurs with good progression and/or short cycle lengths. More <br /> vehicles stop than for LOS A, causing higher levels of average delay. <br /> C Average stopped delay is in the range of 15.1 to 25.0 seconds per vehicle. <br /> These higher delays may results from fair progression and/or longer cycle <br /> lengths. Individual cycles failures may begin to appear in this level. The <br /> number of vehicles stopping is significant at this level, although many still pass <br /> through the intersection without stopping. <br /> D Average stopped delays are in the range of 25.1 to 40.09 seconds per vehicle. <br /> The influence of congestion becomes more noticeable. Longer delays may <br /> result from some combination of unfavorable progression,long cycle length, <br /> or high volume/capacity ratios. Many vehicles stop, and the proportion of <br /> vehicles not stopping declines. Individual cycle failures are noticeable. <br /> E Average stopped delays are in the range of 40.1 to 60.0 seconds per vehicle. <br /> This is considered to by the limit of acceptable delay. These high delay values <br /> generally indicate poor progression,long cycle lengths,and high <br /> volume/capacity ratios. Individual cycle failures are frequent occurrences. <br /> F Average stop delay is in excess of 60 seconds per vehicle. This is considered <br /> to be unacceptable to most drivers. This conditions often occurs with <br /> oversaturation. It may also occur at high volume/capacity ratios below 1.00 <br /> with many individual cycle failures. Poor progression and long cycle lengths <br /> may also be major contributing causes to such high delay levels. <br /> Note: A signal cycle failure is considered to occur when one or more vehicles are forced to wait through more than <br /> one green signal indication for a particular approach. <br /> E-3 <br />