Kentucky studies relating to pavement slipperiness are reviewed. Considerable effort has been devoted to the development of better methods of skid resistance testing and to standardization of testing devices. The development and standardization of a trailer method of test represented significant progress in measurement techniques. Effort was expanded to relate skid resistance data to accident statistics. Relationships between wet-surface accidents and skid resistance were established. These indicated that surfaces with skid resistance less than a "critical" value have disproportionately higher wet accident rates. The development of skid-resistant surface courses to operational status has been studied. The development was undertaken of a sand asphalt in which full reliance for skid resistance would be given to hardness, sharpness and angularity of quartz sand. This was an attribute of Kentucky rock asphalt and sandstone aggregates excelling in skid resistance. Pavement design alternatives using indigenous materials appear to be sand asphalts and open-graded friction courses. Aggregate incorporated in these mixes must be angular and resistant to polishing. These aggregates include: crushed quartz gravel, slag, lightweight (expanded) shale, and possibly sandstones.

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 25 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00264758
  • Record Type: Publication
  • Report/Paper Numbers: Research Rpt. 399
  • Created Date: Feb 11 1975 12:00AM