Development of a Design Flexibility Toolkit

Details

• Alternative Title:
  JTRP Technical Reports
• Creators:
  Jiang, Yi ; Ma, Yan ; Li, Shuo
• Corporate Creators:
  Purdue University. Joint Transportation Research Program
• Corporate Contributors:
  Indiana Department of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Construction Cost Costs Design Exception Highway Design Highway Operations Highway Safety User Benefit User Benefits
• Publication/ Report Number:
  FHWA/IN/JTRP-2012/20
• Resource Type:
  Tech Report
• Geographical Coverage:
  Indiana
• Edition:
  Final report.
• Corporate Publisher:
  Purdue University. Joint Transportation Research Program
• Abstract:
  The American Association of State Highway and Transportation Officials (AASHTO) publication titled A Policy on Geometric Design of
  
  Highways and Streets (Green Book) provides guidance to the designer by referencing a recommended range of values for critical
  
  dimensions for the design of highway facilities. For various reasons, it may be necessary to design a section of highway with substandard
  
  values for some elements. Such design exceptions require appropriate assessment and justification of the potential impacts to highway
  
  safety and operations. This study was performed to develop a guideline for design exceptions. The guideline for development and
  
  evaluation of design exception projects was developed and presented. The guideline outlines the steps for developing and evaluating
  
  design exception projects. The potential impacts of design exception elements to highway safety and operations are listed for the 13
  
  controlling criteria to provide designers with important and easy to use information. The possible counter measures for each of the
  
  controlling criteria are listed in a one-page table for easy reference. The proposed safety evaluation process was presented in terms of
  
  safety impacts of individual substandard elements as well as the combined impacts of the substandard elements. An Excel based
  
  computer program was developed for life-cycle benefit-cost analysis of design exception projects. A decision on design exceptions can
  
  thus be made rationally with the recommended guideline and methods.
  
  
• Format:
  PDF
• Funding:
  SPR-3404
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:e48504f9feaa0c86b237404b4d8157b053c699ac300672dcd10947ef96d365b832e1c8b018fe3d5fb9b512ea46309f4ca7c5a3e0a9eb2e3810ddd06ee385959d
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25432/dot_25432_DS1.pdf
• File Type:
  [PDF - 10.34 MB ]