Appendix B
DEFINITION OF LEVEL OF SERVICE (LOS) Levels of Service (LOS) are qualitative measures describing operational conditions of highways. Six LOS are defined for each facility type and are given designations ranging from "A" (the best) to "F" (the worst). LOS indicates quality of flow measured by a scale of driver satisfaction. · Level of Service A represents free flow. Individual users are virtually unaffected by the presence of others in the traffic stream. · Level of Service B is in the range of stable flow, but the presence of other users in the traffic stream begins to be noticeable. · Level of Service C is also in the range of free flow, but marks the beginning of the range in which the operation of individual users becomes significantly affected by the presence of others. · Level of Service D represents high-density, but stable flow. Speed and freedom to maneuver are severely restricted. · Level of Service E represents operating conditions at or near the capacity level. All speeds are reduced to a low, but relatively uniform value. · Level of Service F is used to define forced or breakdown flow. This condition exists whenever the amount of traffic approaching a point exceeds the amount, which can traverse the point. The roadway capacities (maximum service flow rates) and the LOS shown in this report are based upon the 2002 Level of Service Handbook, Florida Department of Transportation, Systems Planning, and the 2000 Highway Capacity Manual, Transportation Research Board.
2004 Roadway LOS Report
B-1
September 2004
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