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LEVEL OF SERVICE DEFINITIONS <br /> LEVEL <br /> OF UNSIGNALIZED <br /> SERVICE SIGNALIZED INTERSECTIONS INTERSECTIONS <br /> "A" Uncongested operations, all queues clear in a Little or no delay. <br /> single-signal cycle. (Average stopped delay <br /> less than 5 seconds per vehicle.) <br /> "B" Uncongested operations, all queues clear in a Short traffic delays. <br /> single cycle. (Average delay of 5-15 <br /> seconds.) <br /> "C" Light congestion, occasional backups on Average traffic delay. <br /> critical approaches. (Average delay of 15-25 <br /> seconds.) <br /> "D" Significant congestion of critical approaches Long traffic delays. <br /> but intersection functional. Cars required to <br /> wait through more than one cycle during <br /> short peaks. No long queues formed. <br /> (Average delay of 25-40 seconds.) <br /> "E" Severe congestion with some long standing Very long traffic <br /> queues on critical approaches. Blockage of delays, failure, <br /> intersection may occur if traffic signal does extreme congestion. <br /> not provide for protected turning <br /> movements. Traffic queue may block nearby <br /> intersection(s) upstream of critical <br /> approach(es). (Average delay of 40-60 <br /> seconds.) <br /> "F Total breakdown, stop-and-go operation. Intersection blocked <br /> (Average delay in excess of 60 seconds.) by external causes. <br />