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Top Terms > Facilities > Transportation, hydraulic and utility facilities > Highway facilities > Roads > Parts of roads > Pavements > Pavement components > Pavement layers > Subgrade (Pavements)

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Subgrade (Pavements) (Pmrcpppmr)

The top surface of a roadbed upon which the pavement structure and shoulders, including curbs, are constructed. Also, the graded portion of a highway within top and side slopes, prepared as a foundation for the pavement structure and shoulder. (Source: AASHTO Glossary)
Use For
Highway subgrade
Pavement subgrades
Broader Term
Pavement layers (Pmrcpppm)
Related Terms (Hierarchical)
Surface course (Pavements) (Pmrcpppmb)
Base course (Pavements) (Pmrcpppme)
Subbase (Pavements) (Pmrcpppmg)
Pavement interlayers (Pmrcpppmi)