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Safety Performance for Intersection Control Evaluation (SPICE) Tool User Manual

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Safety Performance for Intersection Control Evaluation (SPICE) Tool User Manual Safety Performance for Intersection Control Evaluation (SPICE) Tool User Manual FHWA Safety Program http://safety.fhwa.dot.gov NOTICE This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or the use thereof. This Report does not constitute a standard, specification, or regulation. The contents of this Report reflect the views of the contractor, who is responsible for the accuracy of the data presented herein. The contents do not necessarily reflect the official policy of the U.S. Department of Transportation. The United States Government does not endorse products or manufacturers named herein. Trade or manufacturers’ names appear herein solely because they are considered essential to the object of this report. QUALITY ASSURANCE STATEMENT The Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement. ii TECHNICAL REPORT DOCUMENTATION PAGE 1. Report No. 2. Government Accession No. 3. Recipient's Catalog No. FHWA-SA-18-026 4. Title and Subtitle 5. Report Date Safety Performance for Intersection Control Evaluation (SPICE) Tool User Guide October 2018 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No. Jenior, P., Butsick, A., Haas, P. and Ray, B. 20447 9. Performing Organization Name and Address 10. Work Unit No. (TRAIS) KLS Engineering, LLC (Prime) Kittelson & Associates, Inc. 11. Contract or Grant No. 45155 Research Pl, Suite 200 20 S Charles Street, Suite 406 Ashburn, VA 20147 Baltimore, MD 21201 DTFH61-16-D-00017 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered U.S. Department of Transportation Technical Report User Manual – TBD Federal Highway Administration 1200 New Jersey Ave. SE 14. Sponsoring Agency Code Washington, DC 20590 FHWA 15. Supplementary Notes The Task Order Contracting Officer’s Representative for this report was Jeffrey Shaw. This project was produced as part of the Transportation Pooled Fund Study (http://www.pooledfund.org/), under TPF-5(255) Highway Safety Manual Implementation. 16. Abstract The Safety Performance for Intersection Control Evaluation (SPICE) Tool is intended to aid in the determination of a preferred alternative for a given intersection project by providing an objective, quantifiable basis to compare the safety performance of different intersection types. This tool may be of use to traffic safety researchers and practitioners, transportation planners and engineers, and highway and street designers. This document provides information and guidance on how to use the SPICE Tool, a macro-based, Microsoft Excel spreadsheet, to assess the safety performance of a variety of intersection geometry and control scenarios in terms of predicted crash frequency and severity. 17. Key Words 18. Distribution Statement Intersection safety, highway safety, alternative intersections, No restrictions. intersection control evaluation, intersection screening, intersection crashes, Highway Safety Manual, HSM, Crash Modification Factor, CMF 19. Security Classif. (of this report) 20. Security Classif. (of this page) 21. No. of Pages 22. Price Unclassified Unclassified 52 N/A Form DOT F 1700.7 (8-72) Reproduction of completed page authorized iii iv FOREWORD This document is a user manual for the Safety Performance for Intersection Control Evaluation (SPICE) Tool, a macro-based, Microsoft Excel format spreadsheet. This user manual provides instructions and guidance on how to use this spreadsheet tool to perform safety performance analysis for a variety of intersection geometry and control scenarios. The SPICE Tool provides an objective, quantifiable basis for comparing the safety performance of different intersection types that will help users determine a preferred alternative for a given intersection project. This tool may be of use to traffic safety researchers and practitioners, transportation planners and engineers, and highway and street designers. Michael S. Griffith Director, Office of Safety Technologies Federal Highway Administration DISCLAIMER The Safety Performance for Intersection Control Evaluation (SPICE) Tool is intended to assist planners and engineers with safety analysis. This analysis forms one component of a comprehensive intersection control evaluation (ICE) or alternatives analysis. As such, the results of the SPICE Tool – predicted crashes for different intersection and interchange forms – should not be the sole basis of choosing a given intersection or interchange form for implementation. The SPICE Tool is not intended to be an intersection/interchange form selection tool. Furthermore, the intersection forms contained within the SPICE Tool are not endorsed or preferred over other intersection forms not contained in the SPICE Tool. COVER PHOTO CREDITS Left: Lee Rodergerdts, Kittelson & Associates, Inc Top Right: Federal Highway Administration Bottom Right: Pete Jenior, Kittelson & Associates, Inc v TABLE OF CONTENTS Introduction 1 What is Intersection Control Evaluation (ICE)? ............................................................................................................................ 1 Role of the SPICE Tool .................................................................................................................................................................. 2 Range of HSM Analyses ................................................................................................................................................................ 3 Relationship to Other Tools.......................................................................................................................................................... 3 Using the SPICE Tool 4 Functionality and Requirements .................................................................................................................................................. 4 Introduction Tab........................................................................................................................................................................... 4 Project Information Tab ............................................................................................................................................................... 5 Definitions Tab ............................................................................................................................................................................. 6 Control Strategy Tab .................................................................................................................................................................... 6 At-grade Inputs Tab ...................................................................................................................................................................... 9 Ramp Terminal Inputs Tab ......................................................................................................................................................... 12 Calibration Tab ........................................................................................................................................................................... 13 Results Tab/ResultsRTI Tab ........................................................................................................................................................ 15 Data Sources 18 Safety Performance Functions ................................................................................................................................................... 18 Part D Crash Modification Factors .............................................................................................................................................. 18 Case Studies 20 Case Study #1. New Private Access Driveway ............................................................................................................................ 20 Case Study #2. Intersection Improvement ................................................................................................................................. 25 Case Study #3. New Interchange ............................................................................................................................................... 31 Case Study #4. Existing Two-way Stop with Safety and Capacity Issues .................................................................................... 36 vi LIST OF FIGURES Figure 1. Decision Making Process..................................................................................................................................................... 2 Figure 2. Case Study #1, Site Location. ............................................................................................................................................ 20 Figure 3. Case Study #2, Site Location. ............................................................................................................................................ 25 Figure 4. Case Study #3, Site Location. ...........................................................................................................................................
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