Ride　comfort　is　very　important　in　the　performance　evaluation　of　highway　concrete　pavements.　In　this　paper,　three　indices　were　integrated　and　used　for　the　evaluation　of　ride　comfort　on　asphalt　concrete　pavements:　(1)　weighted　root　mean　square　of　the　acceleration,　(2)　root　mean　square　of　the　squared　differences　(a　measure　of　heart　rate　variability),　and　(3)　weighted　value　of　subjective　ride　comfort.　The　study　involved　collection　of　comprehensive　experimental　data　for　89　highway　sections　in　China　that　included　pavement　roughness,　ride　speed,　acceleration,　dynamic　friction,　psychological　and　physiological　data,　pavement　condition,　and　questionnaires.　Indices　and　thresholds　for　acceleration,　heart　rate　variability,　and　subjective　evaluation　of　ride　comfort　were　developed.　In　addition,　quantitative　relations　between　ride　comfort　and　both　pavement　roughness　and　ride　speed　were　established　for　two　specific　ranges　of　dynamic　friction.　Graphical　relations　among　ride　comfort,　pavement　roughness,　and　ride　speed　were　established.　These　relations　provide　useful　guidelines　for　ride　comfort　evaluation　and　highway　maintenance　management.　©　2015　by　ASTM　International.