Concepts

Level of Service

Also Known As LOS

Road Concept

Citation Formats

General Reference

Transport Atlas. "Level of Service." Accessed August 30, 2026. https://dev-transport.interactiveatlas.org/concepts/level-of-service.

APA Style

Transport Atlas. (n.d.). Level of Service. Retrieved August 30, 2026, from https://dev-transport.interactiveatlas.org/concepts/level-of-service

BibTeX

@misc{transportatlas-level-of-service,
  author = {Transport Atlas},
  title = {Level of Service},
  year = {2026},
  url = {https://dev-transport.interactiveatlas.org/concepts/level-of-service},
  note = {Accessed August 30, 2026}
}

A qualitative A through F grading scale used in traffic engineering to describe the quality of motor vehicle traffic flow on a road or at an intersection, from A, free flow at high speed, down to F, breakdown flow with unacceptable congestion. Introduced in the United States through the 1965 Highway Capacity Manual, it is more suited to American road design than to the higher-capacity roads typical of Europe and the United Kingdom.

Facts

Core Concern

Grading how well a road or intersection is coping with its traffic volume 1

Cross-Tradition Connections

Part Of

Road Transport

Sources

1. Wikipedia: Level of Service (Transportation)

WikipediaLead section

Quote, Lead section

Level of service (LOS) is a qualitative measure used to relate the quality of motor vehicle traffic service.

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