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Geometric Design Practices for Resurfacing, Restoration, and Rehabilitation (2011) / Chapter Skim
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Pages 6-10

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 6...
... and shoulder width; • Superelevation; • Grades, curvature, and stopping sight distance; • Bridge structural capacity and width; • Horizontal clearance to obstructions; • Drainage; • Curbing and channelization; • Sidewalks; • Bikeways; • Utilities; • Lighting; • Aesthetics and landscaping; and • Railroad crossings at grade. FHWA did not accept the Purple Book for nationwide use, and it is no longer published by AASHTO.
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From page 7...
... 7. Presented specific numerical criteria for the geometric design of 3R projects for the following elements: • Lane and shoulder width • Horizontal curvature and superelevation • Vertical curvature • Bridge width • Side slopes • Pavement cross slope Pursuant to its adoption of TRB SR 214, on October 17, 1988, FHWA issued Technical Advisory T5040.28, Developing Geometric Design Criteria and Processes for Non
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From page 8...
... 109 (o) ." The advisory recognizes TRB SR 214 as having "the most current source of data, procedures and recommendations regarding geometric design and its relationship to safety for 3R projects, and that it can be used to develop or modify criteria, processes and practices to achieve the twin objectives of 3R type projects -- preservation and safety enhancement." It also states that the states' 3R design criteria should address all 13 controlling geometric elements mentioned previously and includes recommendations from TRB SR 214 on lane and shoulder widths and bridge widths.
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From page 9...
... The RDG contains guidelines for one of the 13 controlling design elements -- horizontal clearance (other than Clear Zone)
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From page 10...
... Appendix B contains a summary of the recommendations that pertain to the geometric design elements discussed in this synthesis. The information presented in this chapter lays the foundation for the remainder of this synthesis.
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Key Terms

  • design speed
  • cross slope
  • design element
  • research board
  • state dot

  • transportation research
  • structural capacity
  • horizontal clearance
  • horizontal alignment
  • sight distance

  • design criteria
  • pavement improvement
  • project scope
  • pavement edge
  • stopping sight

  • geometric design
  • controlling criteria
  • safety treatments
  • geometric improvements
  • state dots

  • design elements
  • shoulder width
  • zontal curvature
  • design exception
  • traffic volumes

  • lane width
  • vertical clearance
  • vertical alignment
  • highway safety
  • safety cost


    • This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
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