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TABLE 3-2 <br />LEVEL OF SERVICE CRITERIA FOR UNSIGNALIZED INTERSECTIONS (HCM 6 METHODOLOGY)2 <br />Level of Service <br />(LOS) <br />Highway Capacity Manual (HCM) <br />Delay Per Vehicle (seconds/vehicle) <br /> <br />Level of Service Description <br />A  10.0 Little or no delay <br />B > 10.0 and  15.0 Short traffic delays <br />C > 15.0 and  25.0 Average traffic delays <br />D > 25.0 and  35.0 Long traffic delays <br />E > 35.0 and  50.0 Very long traffic delays <br />F > 50.0 Severe congestion <br /> <br />2 Source: Highway Capacity Manual 6, Chapter 20: Two-Way Stop-Controlled Intersections. The LOS criteria apply to each lane on a given <br /> approach and to each approach on the minor street. LOS is not calculated for major-street approaches or for the intersection as a whole. <br />3-75