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                Roadside Safety Analysis Program (RSAP)
**Description:**
        RSAP is an encroachment-based computer software tool for cost-effectiveness evaluation of roadside safety improvements. This version of RSAP (i.e., RSAPv3) was developed under National Cooperative Highway Research Program (NCHRP) Project 22-27, which was completed in 2012.
The analytical model behind the encroachment-based approach uses a series of conditionally independent probabilities representing vehicle roadside encroachment events, the conditional probability of a crash given a roadside encroachment has occurred, the probable severity of crashes that are likely to occur and the expected benefit cost ratios of various roadside design alternatives. Based on the sequential nature of these conditional probabilities and the assumption that they are independent, the RSAPv3 is basically structured into the following four modules:

Encroachment module.
	Crash prediction module.
	Severity prediction module.
	Benefit-cost module.
    
          **Tool Type:**
        Software
    
    
    
          **Owner Source:**
        private_company
    
          **Sponsor/Owner:**
        Roadsafe LLC
    
        **Published:**
      2018
    
        **Availability:**
      The software is available free of charge at the following link: RSAP
    
          **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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