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PIARC (World Road Association), founded in 1909 and comprising 125 member governments from all over the world, is the global forum for exchange of knowledge and experience on roads, road transport policies and practices. With consultative status to the Economic and Social Council of the United Nations, the Association is contributing to a stable and sustainable global development of the road and transport sector.

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Term of the Road Dictionary

capping layer

  • Language : PIARC Road Dictionary / English
  • Theme : Roads Design Pavements
  • Definition : Optional layer of granular or treated material on top of the subgrade and immediately below formation level, to provide improved foundation for the subbase layer [CEN].

Bodenverbesserung des Planums

  • Language : PIARC Road Dictionary / German
  • Theme : Straßen Entwurf Fahrbahnbefestigungen
  • Definition : Optionale Lage aus körnigem oder gebundenem Material auf dem Untergrund/Unterbau und unmittelbar unter der Planumshöhe, um eine verbesserte Unterlage für die untere Tragschicht zu schaffen (CEN).
  • Synonyms : verbesserter Unterbau / Unterbettung (AT)