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CHAPTER 4 TRANSPORTATION 72 <br /> Level of service C is stable flow but much of the time speed and ability to <br /> change lanes is restricted by the presence of other traffic. Operating <br /> speeds are reduced to % or -X of maximum. <br /> Level of service D approaches unstable flow. Tolerable speeds are <br /> maintained but are subject to sudden variations and the probability of <br /> accidents is increased. <br /> Level of service E describes operating speeds lower than level D. The <br /> traffic volumes are at or near capacity. <br /> Level of service F describes congested conditions. Speeds and volumes <br /> are less than level of services E and may drop to zero for short periods. <br />