Average travel speeds near 60 mph generally prevail on 70-mph freeway elements.
Vehicles are almost completely unimpeded in their ability to maneuver within the traffic stream.
This affords the motorist a high level of physical and psychological comfort. The effects of minor incidents or breakdowns are easily absorbed at this level. Although they may cause a deterioration in LOS in the vicinity of the incident, standing queues will not form, and traffic quickly returns to LOS A on passing the disruption. The ability to maneuver within the traffic stream is only slightly restricted, and the general level of physical and psychological comfort provided to drivers is still high. The effects of minor incidents and breakdowns are still easily absorbed, though local deterioration of service would be more severe than for LOS A. Level of Service C - Level C provides for stable operations, but flows approach the range in which small increases in flow will cause substantial deterioration in service.