Development of a Design Flexibility Toolkit : [Technical Summary]

Details

• Creators:
  Jiang, Yi ; Li, Shuo
• Corporate Creators:
  Purdue University. Joint Transportation Research Program
• Corporate Contributors:
  Indiana Department of Transportation
• Subject/TRT Terms:
  Construction Cost Costs Design Exception Highway Design Highway Operations Highway Safety User Benefit User Benefits
• Publication/ Report Number:
  SPR-3404
• Resource Type:
  Booklet/Pamphlet
• Geographical Coverage:
  Indiana
• Edition:
  Technical summary.
• 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 new alignments and those undergoing
  
  major reconstruction. These guidelines permit sufficient
  
  flexibility to encourage independent designs for specific
  
  situations. The approach allows the designer to use
  
  flexibility to introduce “lower than typical” design values
  
  for a specific element to address an impacted area. This
  
  process allows for adjusting almost every aspect of the
  
  geometric design and may require both state and federal
  
  approval. Use of design flexibility may include use of a
  
  design exception. The current version of the Indiana Design
  
  Manual (IDM) provides and promotes some level of
  
  flexibility, particularly on non-NHS routes. The selection
  
  of design criteria for a transportation project is typically
  
  screened by the highway system the project is located
  
  on, functional classification, area type, forecasted traffic
  
  data and classification of project type. The use of design
  
  exceptions is one way to obtain design flexibility. Design
  
  exceptions require appropriate level of justification.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:088dc71d6ceb588fef490f88fc10e11cc37b3989f90295b718f21f263ba592742812b97dfb0202fe0dbe45fbc37887f842dbef91255fe5fdf9d4d1df2f138beb
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25433/dot_25433_DS1.pdf
• File Type:
  [PDF - 757.16 KB ]