SKID NUMBER AND SPEED GRADIENTS ON HIGHWAY SURFACES (ABRIDGMENT)

Three major factors that influence the skid number and speed gradient were studied: tire tread depth, water film, and pavement surface texture. Only the effect of pavement surface is discussed in this report. The pavements were catagorized into three groups: steep gradients, (G) intermediate gradients, and flat gradients. Thirty one sites were investigated for each of the three catagories of gradients. Data was analyzed and evalauted. The results show that high speed gradient values are common to pavements that do not have a relatively high degree of macrotexture. The highest skid numbers recorded in the study were at low speeds in the steep gradient group, which means that a low macrotexture and a high macrotexture provide the best skid-resistance surface at low speeds. The opengraded mixes, which provide flat gradients, provide a very desirable surface for high-speed traffic. Grooving does not improve the skid resistance or the G value for treaded tires. Because grooving does not decrease the G value, it is suggested that the mere provision for water escape does not guarantee that the pavement surface will have a flat gradient.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1976/602/602-013.pdf
• Summary URL:
  • https://scholar.google.com/scholar_lookup?title=SKID+NUMBER+AND+SPEED+GRADIENTS+ON+HIGHWAY+SURFACES+(ABRIDGMENT)&author=D.+Mahone&publication_year=1976
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309220710
• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Surface Properties Vehicle Interaction. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Mahone, David C
• Publication Date: 1976

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 69-71
• Monograph Title: Pavement design, evaluation and performance
• Serial:
  • Transportation Research Record
  • Issue Number: 602
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: High speed ground transportation; High speed vehicles; Highway grades; Macrotexture; Open graded aggregates; Pavement grooving; Pavements; Skid resistance; Skidding; Slopes; Speed; Surface course (Pavements); Texture; Tires
• Uncontrolled Terms: Skid number
• Subject Areas: Highways; Pavements; Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00156006
• Record Type: Publication
• ISBN: 0309220710
• Files: TRIS, TRB
• Created Date: Aug 15 1977 12:00AM