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w <br />w <br />i <br />LEVEL OF SERVICE TYPE OF FLOW DELAY MANEUVERABILITY <br />A Free flow Little or no delay Low volumes and densities; drivers <br />can maintain their desired speeds. <br />B Stable flow Little or no delay Operating speeds beginning to be <br />restricted somewhat by traffic <br />conditions. <br />C Stable flow Occasional delays Speed and maneuverability are more <br />(Design Level) closely controlled because of <br />higher volumes. <br />D A41 <br />TABLE 3.3-1. DESCRIPTION OF LEVELS OF SERVICE FOR ROADWAYS <br />periods <br />ISource: Institute of Transportation and Traffic Engineering, 1969. <br />pproaching 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 />ISource: Institute of Transportation and Traffic Engineering, 1969. <br />