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I DKS Associates <br />Table 3 -3 <br />Level of Service Interpretation <br />Delay Range Volume -to- <br />Level of (Sec. per Capacity <br />Service Description Vehicle) Ratio <br />A Excellent operation. All approaches to the intersection <5 0.50 <br />appear quite open, turning movements are easily made, <br />and nearly all drivers find freedom of operation. <br />B Very good operation. Many drivers begin to feel 5.1 -15.0 .61 -.70 <br />somewhat restricted within platoons of vehicles. This <br />represents stable now. An approach to an intersection <br />may occasionally be fully utilized and traffic queues <br />start to form. <br />C Good operation. Occasionally drivers may have to 15.1 -25.0 .71 -.80 <br />wait more than 60 seconds, and back -ups may develop <br />behind turning vehicles. Most drivers feel somewhat <br />restricted. <br />D Fair operation. Cars are sometimes required to wait 25.1 -40.0 .81 -.90 <br />more than 60 seconds during short peaks. There are <br />no long-standing traffic queues. This level is <br />typically associated with design practice for peak <br />periods. <br />E Poor operation. Some long- standing vehicular 40.1 -60.0 .91 -1.00 <br />queues develop on critical approaches to intersections. <br />Delays may be up to several minutes. <br />F Forced flow. Represents jammed conditions. Backups >60 Over 1.00 <br />from locations downstream or on the cross street may <br />restrict or prevent movement of vehicles out of the <br />intersection approach lanes; therefore, volumes carried <br />are not predictable. Potential for stop and go type <br />traffic flow. <br />Source: High4wy Capacity Manual, Transponation Research Board, Special Report No. 209, Washington, D.C., 1985 <br />28657P90223r0. Rpr 15 <br />75C -547 <br />