U.S. Department of Transportation
Federal Highway Administration
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Washington, DC 20590
202-366-4000
Models define relation between levels
Bottom level: demands on raw materails and building materials; composition, grading, voids, degree of compaction, PSV, pen, TR&B, etc.
Level Two: elementary material properties; resistance against fatigue, deformation, cracking, thickness, etc.
Level Three: construction demands; strength, bearing capacity, durability, etc.
Level Four: function demands; friction, evenness, noise reduction, number of lanes, etc.
Top Level: user demands; safety, comfort, accessibility, travel time, etc.
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