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Publication Number:  FHWA-HRT-18-046    Date:  November 2018
Publication Number: FHWA-HRT-18-046
Date: November 2018

 

Speed-Safety Analyses Using Linked National Performance Management Research Data Set (NPMRDS) and SHRP2 Roadway Information Database (RID) Data

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FOREWORD

This report documents a case study in which data from the Transportation Research Board’s second Strategic Highway Research Program Roadway Information Database (RID) were linked with data from the Federal Highway Administration’s National Performance Management Research Data Set (NPMRDS).(1,2) Speed and speed–safety relationships were then investigated using the linked NPMRDS-RID data. The study focused on urban interstates and divided major arterials in Washington State. The NPMRDS contains travel-time data for highway segments from which operating speeds along the segments (links) were estimated. Relationships between operating speeds and posted speeds for passenger cars during noncongested conditions were determined through regression analysis. In addition, linear regression was conducted to address the research question: How is crash severity related to the differential between the posted speed and the 85th-percentile operating speed for passenger cars on urban interstates and major divided arterials in Washington State during noncongested conditions?

The target audience for this report includes researchers examining speed–safety relationships and highway safety practitioners.

James S. Pol, P.E., PMP
Acting Director, Office of Safety
Research and Development

Notice

This document is disseminated under the sponsorship of the U.S. Department of Transportation (USDOT) in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document.

The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers’ names appear in this report only because they are considered essential to the objective of the document.

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.

 

Technical Report Documentation Page

1. Report No.

FHWA-HRT-18-046

2. Government Accession No.

 

3 Recipient's Catalog No.

 

4. Title and Subtitle

Speed–Safety Analyses Using Linked National Performance Management Research Data Set (NPMRDS) and SHRP2 Roadway Information Database (RID) Data

5. Report Date

November 2018

6. Performing Organization Code

 

7. Author(s)

Michael Dimaiuta, Mohamad Banihashemi, Bruce Spear, Robert Hull, Pamela Beer, Omar Smadi (ORCID: 0000-0002-3147-9232), and Zach Hans

8. Performing Organization Report No.

 

9. Performing Organization Name and Address

Genex Systems
11848 Rock Landing Drive
Newport News, VA 23606

 

Cambridge Systematics
101 Station Landing, Ste. 410
Medford, MA 02155

 

Center for Transportation Research and Education
Iowa State University
2711 S. Loop Drive, Ste. 4700
Ames, IA 50010

10. Work Unit No. (TRAIS)

 

11. Contract or Grant No.

Contract DTFH61-14-D00043; Task Order DTFH61-14-D00043-T-5010

12. Sponsoring Agency Name and Address

Federal Highway Administration
Office of Safety Research and Development
6300 Georgetown Pike
McLean, VA 22101

13. Type of Report and Period Covered

Research Report; September 2015–December 2017

14. Sponsoring Agency Code

HRDS-10

15. Supplementary Notes

Abdul Zineddin (HRDS-10; Abdul.Zineddin@dot.gov), Office of Safety Research and Development, served as the Task Order Task Manager for the Federal Highway Administration.

16. Abstract

The case study documented in this report involves linking the second Strategic Highway Research Program (SHRP2) Roadway Information Database (RID) with the National Performance Management Research Data Set (NPMRDS) and then using the linked data to examine speed and speed–safety relationships.(1,2) This report includes the following information:

  • An overview of the SHRP2 safety data.
  • An overview of the RID and the NPMRDS.
  • The methodology developed to link the RID with the NPMRDS.
  • Additional data preparation required to conduct analyses using the linked data.
  • A summary of the analyses conducted.
  • A description of the value of the results related to highway safety.
  • Proposed future research directions.
17. Key Words

Safety, SHRP2, Roadway Information Database, geographic information system, NPMRDS

18. Distribution Statement

No restrictions. This document is available through the National Technical Information Service, Springfield, VA 22161.
http://www.ntis.gov

19. Security Classification
(of this report)

Unclassified

20. Security Classification
(of this page)

Unclassified

21. No. of Pages

104

22. Price

N/A

Form DOT F 1700.7 (8-72) Reproduction of completed page authorized

 

 

 

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