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Over the past decade, there has been a trend toward higher speed limits, especially on rural interstates and freeways. Eleven states have increased speed limits to 75 mph, with some of them raising the limit as high as 85 mph on freeways and 75 mph on other roads.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 1006: Guide to Understanding Effects of Raising Speed Limits provides a better understanding of the expected safety implications of increasing speed limits to 75 mph or higher.

Supplemental to the report are a presentation and NCHRP Web-Only Document 328: Safety Effects of Raising Speed Limits to 75 mph and Higher.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2022. Guide to Understanding Effects of Raising Speed Limits. Washington, DC: The National Academies Press. https://doi.org/10.17226/26769.

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Publication Info

36 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/26769
Chapters skim
Front Matter i-viii
Chapter 1 - Introduction 1-3
Chapter 2 - Safety and Operational Considerations 4-15
Chapter 3 - Collaboration and Communication 16-18
Chapter 4 - Economic Considerations 19-23
Chapter 5 - Presentation of Evaluation Findings and Recommendations 24-24
Acronyms and Abbreviations 25-25
References 26-30

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