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Federal Highway Administration
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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
| REPORT |
| This report is an archived publication and may contain dated technical, contact, and link information |
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| Publication Number: FHWA-HRT-18-046 Date: November 2018 |
Publication Number: FHWA-HRT-18-046 Date: November 2018 |
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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.
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Technical Report Documentation Page
| 1. Report No.
FHWA-HRT-18-046 |
2. Government Accession No.
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3 Recipient's Catalog No.
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| 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 |
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| 6. Performing Organization Code
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| 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.
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| 9. Performing Organization Name and Address
Genex Systems
Cambridge Systematics
Center for Transportation Research and Education |
10. Work Unit No. (TRAIS)
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| 11. Contract or Grant No.
Contract DTFH61-14-D00043; Task Order DTFH61-14-D00043-T-5010 |
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| 12. Sponsoring Agency Name and Address
Federal Highway Administration |
13. Type of Report and Period Covered
Research Report; September 2015–December 2017 |
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| 14. Sponsoring Agency Code
HRDS-10 |
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| 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. |
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| 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:
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| 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. |
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| 19. Security Classification (of this report) Unclassified |
20. Security Classification (of this page) Unclassified |
21. No. of Pages
104 |
22. Price
N/A |
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| Form DOT F 1700.7 (8-72) | Reproduction of completed page authorized |
