Level of Service (LOS) metrics provide a standardized framework for rating the operational performance of transport infrastructure and services, typically on a scale from A (free flow, minimal delays) to F (breakdown of flow, severe congestion).
Source: https://en.wikipedia.org/wiki/Level_of_service_(transportation)
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P50/P80 transit times for sea, air and road — sourced and confidence-rated, not a carrier quote.
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