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                Illinois Department of Transportation Over-Representation Tool
**Description:**
        The over-representation tool is a Microsoft® Excel® user form and Visual Basic-based application to test for over-representation of various crash-related characteristics. The tool assesses if an intersection or roadway segment has over-represented characteristics compared to Illinois statewide expected crash frequencies. Expected crash frequencies can be aggregated based on total statewide averages or disaggregated into smaller peer groups. The following is a general description of the operation of the tool.

Select the appropriate segment or intersection parameters for the test location.
	Select the specific peer group for the test location. If the peer group information is unknown, select all peer groups.
	Select the over-representation threshold. Value options are 0.90, 0.95, or 0.99.
	Input test location data, if applicable (see below for details).
	Select up to five crash characteristic categories to analyze.
	Populate the crash categories accordingly.
    
          **Tool Type:**
        Software
    
    
    
          **Owner Source:**
        state
    
          **Sponsor/Owner:**
        Illinois Department of Transportation
    
        **Published:**
      2017
    
        **Availability:**
      The tool is available free of charge at the following link: Illinois DOT Over-Representation Tool.
    
          **Disclaimer:**
        This information is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained herein. This information does not constitute a standard, specification, or regulation. The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturer's names appear in this information only because they are considered essential to the objective of this publication.
          Any opinions, findings, and conclusions or recommendations, and translations thereof, expressed in this publication are those of the author(s) and do not necessarily reflect the views of the Federal Highway Administration. U.S. DEPARTMENT OF TRANSPORTATION

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