Development of Levels of Service for the Interstate Highway System (2010) / Chapter Skim
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S U M M A R Y Background The purpose of NCHRP Project 20-74(A) was to develop an approach to measuring levels of service of the Interstate Highway System (IHS)
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2Assess the State of the Practice This research identifies level-of-service indicators and measures that would enable monitoring of IHS conditions against national objectives. The team conducted a literature search, using resources from TRB, FHWA, NHTSA, AASHTO, and others.
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to network-level reporting of IHS LOS. In almost all states, there is system-level measurement and reporting of LOS for major assets, as well as mobility and safety performance.
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4such as pavement markings. The "indicators" are the conditions to be measured, while the "measures" quantify the extent to which conditions exist.
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Implementation Considerations There are a number of important considerations in developing an effective IHS LOS program. These include the frequency of LOS surveys, data collection, using a pass/fail versus a quantitative approach, data weighting, aggregation of measures, and implementation issues.
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