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_ <br /> ATTAC*IENT sir <br /> U <br /> OPERATING CONDITIONS FOR LEVELS OF SERVICE <br /> LEVEL OF SERVICE A:. THIS IS A CONDITION OF FREE FLOW, <br /> ACCOMPANIED BY LOW VOLUMES AND HIGH SPEEDS. <br /> LEVEL OF SERVICE B: THIS. OCCURS IN THE ZONE- OF STABLE <br /> • FLOW, WITH OPERATING SPEEDS. BEGINNING. TO BE RESTRICTED. <br /> SOMEWHAT BY TRAFFIC CONDITIONS:. - <br /> LEVEL OF SERVICE C: THIS IS STILL IN THE ZONE OF STABLE <br /> FLOW, Bur SPEEDS AND MANEUVERABILITY ARE MORE CLOSELY <br /> CONTROLLED BY THE HIGHER VOLUMES. <br /> LEVEL OF SERVICE D: THIS- LEVEL OF SERVICE APPROACHES <br /> UNSTABLE FLOW, WITH TOLERABLE OPERATING- SPEEDS BEING <br /> MAINTAINED, THOUGH CONSIDERABLY AFFECTED BY CHANGES IN. <br /> OPERATING CONDITIONS. <br /> LEVEL OF SERVICE E:: THIS: CANNOT BE DESCRIBED BY SPEED <br /> ALONE, BUT REPRESENTS OPERATIONS AT LOWER OPERATING <br /> SPEEDS, TYPICALLY, BUT NOT' ALWAYS, IN THE NEIGHBORHOOD OF <br /> 30 MILES PER HOUR, WITH VOLUMES AT OR NEAR THE. CAPACITY OF <br /> THE HIGHWAY. <br /> LEVEL. OF SERVICE F: THIS DESCRIBES A FORCED—FLOW OPERA— <br /> TION AT- LOW SPEEDS, WHERE VOLUMES ARE BELOW CAPAC <br /> ITY. IN <br /> THE EXTREME, BOTH SPEED AND VOLUME CAN DROP TO ZERO. <br /> • <br /> • <br />