# Level of Service (LOS) Metrics in Transport Planning

*Last updated: 2026-06-25*

> 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).

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). Transport planners use LOS values to pinpoint bottlenecks, justify infrastructure investment, and track network efficiency over time. In freight logistics, the LOS of a corridor or terminal directly affects achievable transit times and, by extension, supply chain reliability. LOS should not be confused with contractual Service Level Agreements (SLAs), which govern performance obligations between private parties.

**Source:** [https://en.wikipedia.org/wiki/Level_of_service_(transportation)](https://en.wikipedia.org/wiki/Level_of_service_(transportation))

## Quick Facts

| Property | Value |
|---|---|
| Term | Level of Service (LOS) Metrics in Transport Planning |
| Language | EN |
| Word count | 92 |
| Last updated | 2026-06-25 |
| Source | https://en.wikipedia.org/wiki/Level_of_service_(transportation) |

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