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 ConcernGrading how well a road or intersection is coping with its traffic volume 1 FAQs
What does a Level of Service grade of F mean for a road or intersection?
Breakdown flow with unacceptable congestion, the bottom of the A through F traffic engineering scale.
Level of Service is 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. It was introduced in the United States through the 1965 Highway Capacity Manual, and is more suited to American road design than to the higher capacity roads typical of Europe and the United Kingdom.
Sources
1. Wikipedia: Level of Service (Transportation)
WikipediaLead section
Level of service (LOS) is a qualitative measure used to relate the quality of motor vehicle traffic service.
In Group: Road Traffic Measures, Lead sentence
Level of service (LOS) is a qualitative measure used to relate the quality of motor vehicle traffic service.
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