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This data depicts Level of Service for NHS Interstate, NHS Non-Interstate and Primary routes in the state of Montana.
There are six Levels of Service (LoS). These levels are given letter designations from A to F, with LOS A representing the best operating conditions and LOS F the worst. Each level of service represents a range of operating conditions. The definitions for these ranges vary based on the type of facility being analyzed. General definitions of the operating conditions that exist at each level follows:
LOS A – Vehicles are completely unimpeded in their ability to maneuver within the traffic stream; almost no platoons are observed.
LOS B – 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. Minor disruptions are still easily absorbed at this level.
LOS C – Freedom to maneuver within the traffic stream is noticeably restricted. There are noticeable increases in platoon formation, platoon size, and frequency of passing impediments. Minor disruptions may be expected to cause serious local deterioration in service, and queues may form behind any significant traffic disruption.
LOS D – Freedom to maneuver is more noticeably limited, and the driver experiences reduced physical and psychological comfort levels. Even minor incidents can be expected to create queuing because the traffic stream has little space to absorb disruptions.
LOS E – Roadway is operating at capacity. Operations at this level are volatile, there being virtually no usable gaps in the traffic stream.
LOS F – Describes breakdowns in vehicular flow.
LOS is generated from traffic count data from 2016. 5YR, 10YR and 20YR respectively extrapolate for future growth in 2021, 2026 and 2036.