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The Montana Department of Transportation (MDT) uses the "Level of Service" (LOS) metric to measure the quality of traffic flow and road conditions on Montana highways. The system uses a letter grade, from A to F, to assess conditions based on factors like vehicle speed, congestion, and travel time. LOS is a standard transportation planning tool based on the federal Highway Capacity Manual<\/i> (HCM).<\/span><\/p>

MDT LOS grades<\/font><\/p>