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TABLE 3.3-1. DESCRIPTION OF LEVELS OF SERVICE FOR ROADWAYS <br />LEVEL OF SERVICE TYPE OF FLOW DELAY MANEUVERABILITY <br />A <br />Free flow <br />Little or no delay <br />Low volumes and densities; drivers <br />can maintain their desired speeds. <br />B <br />Stable flow <br />Little or no delay <br />Operating speeds beginning to be <br />restricted somewhat by traffic <br />conditions. <br />C <br />Stable flow <br />Occasional delays <br />Speed and maneuverability are more <br />(Design Level) <br />closely controlled because of <br />higher volumes. <br />D <br />Approaching un- <br />More frequent delays <br />Speed and maneuverability con- <br />stable flow <br />siderably affected by operating <br />conditions. <br />E <br />Unstable flow <br />Momentary stoppages <br />Low operating speeds; little or <br />(Capacity) <br />of traffic flow <br />no driver freedom to maneuver. <br />F <br />Forced flow <br />Stoppages may occur <br />Both speed and volumes can drop <br />over short or long <br />to zero. <br />periods <br />Source: Institute of Transportation and Traffic Engineering, 1959. <br />