Term of the Road Dictionary
- Language : PIARC Road Dictionary / English
- Theme : Roads Materials Mixed Materials
- Definition : Asphalt mixture of the gap-graded type designed to have a very high content (20 % by volume or more) of interconnected voids so as to facilitate the passage of water [CEN].
- Abbreviation : PA
- Synonyms : draining asphalt (US) / permeable friction course (US) / pervious coated macadam [obsolete]