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GIS SPIS Documentation
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The Safety Priority Index System is a method originally developed in 1986 by the Oregon Department of Transportation (ODOT) for identifying potential safety problems on state highways. SPIS complies with the Federal Highway Safety Improvement Program (HSIP) and has been accepted by the Federal Highway Administration (FHWA) as fulfilling the requirements of the HSIP. In 2012 ODOT developed a GIS SPIS that includes all functional classed roads in Oregon. Below is help documentation for using the new GIS SPIS:
 
 Introduction to SPIS 
 1- Sources of SPIS Data 
 2- Source of Annual SPIS Crash Data 
 3- SPIS ETL (Extract, Translate, and Load Data) Process 
 4- Annual SPIS Formulas 
 5- Annual SPIS Sliding Window 
 6- Using Annual SPIS 
 7- Annual SPIS Cut-off Values and Percentage Ranks 
 8- Understanding Annual SPIS Reports 
 9- On-State Segment Length Discrepancy 
 10- OASIS Introduction 
 11- OASIS Data 
 12- OASIS General Settings 
 13- OASIS Crash Conditions 
 14- OASIS Equations 
 15- OASIS Reports 
 16- Crash Summary Report 
 A1- Appendix – SPIS Glossary 
 A2- Appendix – SPIS Available Resources 
 
Read Frequently Asked Questions about SPIS.
 
Also here is a link to the SPIS Calculator Tool in excel.
 
View this PowerPoint Presentation explaining GIS SPIS.