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Across the United States, maximum speed limit laws vary dramatically. In the mid-1990s, many states increased speed limits to 75 mph on select roads. More recently, some states have established speed limits greater than 75 mph.

The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 328: Safety Effects of Raising Speed Limits to 75 mph and Higher is supplemental to NCHRP Research Report 1006: Guide to Understanding Effects of Raising Speed Limits.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2022. Safety Effects of Raising Speed Limits to 75 mph and Higher. Washington, DC: The National Academies Press. https://doi.org/10.17226/26770.

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Publication Info

204 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/26770
Chapters skim
Front Matter i-xiii
CHAPTER 1. Background 1-2
CHAPTER 2. Literature Review 3-33
CHAPTER 3. State of Practice 34-38
CHAPTER 4. Roadside Hardware Suitability for Elevated Speed Limits 39-55
CHAPTER 5. Spillover Study 56-58
CHAPTER 6. Texas Safety Assessment 59-95
CHAPTER 7. Kansas Safety Assessment 96-137
CHAPTER 8. Transferability Assessment via Socioeconomic Analysis 138-158
CHAPTER 9. Operating Speed Associated with Rural Freeway Maximum Speed Limit Changes from 70 to 75 mph (Kansas) 159-165
CHAPTER 10. Conclusions 166-169
REFERENCES 170-182
APPENDIX A. Summary Tables for Socioeconomic Comparison Study 183-190

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