NEW DESIGN METHOD FOR SECONDARY AND SUBDIVISION ROADS IN VIRGINIA BASED ON THICKNESS EQUIVALENCY VALUES

In Virginia eight district engineers and 96 county engineers are responsible for the design of secondary and subdivision roads. A new design method for secondary and subdivision roads based on the experiences of these district and county engineers and on AASHO Road Test results was developed. At the recommendation of the engineers, a soil support value-- the sum of the California bearing ratio and the soil resiliency values--was developed. To meet the requirements of the design method, thickness equivalencies (strength of each paving material per inch depth) were developed. To faclitate use of the method, a design momograph based on subgrade soil support values and traffic was devised. The new design method (a) provides great flexibility in the choices and thicknesses of paving materials (it accommodates previously used design techniques and gives additional design choices); (b) is so simple technicians can use it with ease; and (c) provides a much improved method of evaluating soil support.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0360859X
• Supplemental Notes:
  • Proceedings of a work shop held June 16-19, 1975, in Boise, Idaho by the Transportation Research Board.
• Corporate Authors:

  Transportation Research Board (TRB)

  Washington, DC   
• Authors:
  • Vaswani, N K
• Publication Date: 1975

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 218-229
• Monograph Title: Low-volume roads: proceedings of a workshop held June 16-19, 1975, in Boise, Idaho
• Serial:
  • Transportation Research Board Special Report
  • Issue Number: 160
  • Publisher: Transportation Research Board
  • ISSN: 0360-859X

Subject/Index Terms

• TRT Terms: Bearing capacity; Design methods; Secondary roads; Streets; Subdivisions; Thickness
• Old TRIS Terms: Soil support value; Subdivision streets; Thickness equivalence
• Subject Areas: Design; Highways; Pavements;

Filing Info

• Accession Number: 00142709
• Record Type: Publication
• Files: TRIS, TRB, ATRI
• Created Date: Feb 1 1977 12:00AM