Interchange Safety Analysis Tool (ISAT) : user manual

Details

• Creators:
  Torbic, Darren J. ; Harwood, D. W. ; Gilmore, D. K. ; Richard, K. R.
• Corporate Creators:
  Midwest Research Institute (Kansas City, Mo.)
• Corporate Contributors:
  United States. Federal Highway Administration. Office of Safety Research and Development
• Subject/TRT Terms:
  Highway Design Highway Safety Interchanges Safety Engineering
• Publication/ Report Number:
  FHWA-HRT-07-045
• Resource Type:
  Tech Report
• Contracting Officer:
  Bared, Joe G.
• Corporate Publisher:
  Turner-Fairbank Highway Research Center
• Abstract:
  This User Manual describes the usage and operation of the spreadsheet-based Interchange Safety Analysis Tool (ISAT). ISAT provides design and safety engineers with an automated tool for assessing the safety effects of geometric design and traffic control features at an existing interchange and adjacent roadway network. ISAT can also be used to predict the safety performance of design alternatives for new interchanges and prior to reconstruction of existing interchanges. The primary outputs from an analysis include: the number of predicted crashes for the entire interchange area, the number of predicted crashes by interchange element type (i.e., mainline freeway segments, ramps, ramp terminals and intersections, and crossroad roadway segments), the number of predicted crashes by year, and the number of predicted crashes by collision type. This User Manual presents basic information for getting started with using ISAT, the general methodology that users will follow when conducting an analysis with ISAT, input requirements of the program, default data incorporated within the program and recommendations on when and how these default data should be updated by the user, output reports generated by ISAT, and general information on different applications for which ISAT can be applied. An example problem is also provided on the safety performance of a rural diamond interchange and surrounding roadway network, illustrating user inputs and generated output reports.
• Format:
  PDF
• Funding:
  DTFH61-05-P-00302
• Collection(s):
  Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:44c097be7c2d54179279a9f8ec25facdcf8ecab2dccbfe4c56f51be2a2c5a91c411e6a366eee2a1f2996a187692de5ac27af2040c400ce10ddddb2bb67e5e324
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/832/dot_832_DS1.pdf
• File Type:
  [PDF - 776.77 KB ]