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5.ENVIRONMENTAL CHECKLIST MOUNTAIN HOUSE NEIGHBORHOODS KAND L INITIAL STUDY <br /> 15. TRANSPORTATION/TRAFFIC <br /> Table 5.15-$ LEVEL OF SERVICE CRITERIA FOR SIGNALIZED INTERSECTIONS <br /> Control <br /> Delay/ <br /> Vehicle <br /> LOS Type of Flow Delay Maneuverability slveh <br /> Very slight delay. Progression is Turning movements are easily made, <br /> A Stable Flow very favorable,with most vehicles and nearly all drivers find freedom of <10.0 <br /> arriving during the green phase and operation. <br /> not stopping at all. <br /> Good progression and/or short cycle Vehicle platoons are formed. Many <br /> lengths. More vehicles stop than for <br /> B Stable Flow L05 A,causing higher levels of drivers begin to feel somewhat >10-20 <br /> averse delay. restricted within groups of vehicles. <br /> Higher delays resulting from fair <br /> progression and/or longer cycle <br /> lengths. Individual cycle failures Back-ups may develop behind <br /> C Stable Flow may begin to appear at this level. fuming vehicles. Most drivers feel >20-35 <br /> The number of vehicles stopping is <br /> significant,although many still pass somewhat restricted. <br /> through the intersection without <br /> stopping. <br /> The influence of congestion <br /> becomes more noticeable. Longer <br /> delays may result in some <br /> combination of unfavorable <br /> Approaching progression,long cycle lengths,or Maneuverability is severely limited <br /> D during short periods due to >35-55 <br /> Unstable Flow high volume-to-capacity ratios. <br /> temporary back-ups. <br /> Many vehicles stop,and the <br /> proportion of vehicles not stopping <br /> declines. Individual cycle failures <br /> are noticeable. <br /> Generally considered to be the limit <br /> of acceptable delay. Indicative of There are typically long queues of <br /> E Unstable Flow Poor progression,long cycle lengths, vehicles waiting upstream of the >55-80 <br /> and high volume-to-capacity ratios. intersection. <br /> Individual cycle failures are frequent <br /> occurrences. <br /> Generally considered to be <br /> unacceptable to most drivers. Often Jammed conditions. Back-ups from <br /> occurs with oversaturation. May also other locations restrict or prevent <br /> F Forced Flow occur at high volume-to-capacity movement. Volumes may vary >80 <br /> ratios. There are many individual widely,depending principally on the <br /> cycle failures. Poor progression and downstream back-up conditions. <br /> long cycle lengths may also be major <br /> contributing factors. <br /> Notes: LOS=level of service. <br /> slveh=seconds per vehicle. <br /> Source: TJKM,2011. <br /> term 1) 5-168 <br />