01838574

Monograph

https://www.trb.org/Main/Blurbs/182694.aspx

This report describes the development of an update to the Roadside Safety Analysis Program (RSAP). The report is divided into several essentially independent reports. The main body of this report describes the background, history and philosophy behind the RSAP program and provides a very brief overview of the new program, described throughout this report as RSAPv3 to distinguish it from earlier versions of RSAP. Appendix A is a USER’S MANUAL for RSAPv3 which provides detailed explanations for how to use the program. The User’s Manual is intended for any and all users of RSAPv3 from novices to experts. The User’s Manual provides several example problems to help new users in learning how to effectively manipulate and use the program and also provided input collection forms. Appendix B is the ENGINEER’S MANUAL for RSAPv3. The Engineer’s Manual provides the technical background behind the code and presents the details of the methodologies used to perform the analyses. The Engineer’s Manual is intended for those who might want to add or update information in the program like new severity models, new trajectories or new vehicle types. Appendix C is the PROGRAMMER’S MANUAL which documents how the program is structured and how it functions from a programming point of view. Most additions and improvements can be made without changing the code by following the instructions in the Engineer’s Manual but for those cases where a coding change is required the Programmer’s Manual will be essential. Lastly, the user survey conducted at the onset of this research is documented in full in Appendix D. These documents fully document the methods, data and use of RSAPv3. RSAPv3 was completely rewritten and coded as an MS Excel macro-enabled workbook. Earlier versions of RSAP used a Monte Carlo method to estimate the probability of a crash but RSAPv3 uses a deterministic method that avoids the Monte Carlo method and the convergence issues associated therewith. The program was written such that nearly all modules can be easily changed by modifying look-up tables rather than recoding. For example, if new research results in a new base encroachment model or a new severity model for a new type of guardrail, these can be incorporated simply by changing the look-up tables within Excel. This feature should make updating RSAPv3 as new research becomes available relatively easy and should ensure that the code will not need to be changed very often.

Submitted October 2012.

NCHRP Project 22-27

English

31p

2022

NCHRP Web-Only Document

9780309315838

Digital/other

Appendices; Figures; References; Tables

Computer program documentation; Data analysis; Highway safety

Microsoft Excel (Software); Roadside Safety Analysis Program

Data and Information Technology; Highways; Safety and Human Factors

TRIS, TRB, ATRI

Mar 11 2022 1:45PM