The Safety Impact of the 65 Mph Speed Limit - a Time Series Analysis. Final Grant Report
R. C. Pfefer
- Mangaka
- R. C. Pfefer
- First published
- 1989
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Where it came from
This technical report was commissioned by the Illinois Department of Transportation and prepared by R. C. Pfefer of the Traffic Institute at Northwestern University. It was released in the late 1980s as part of a broader national effort to evaluate the public safety implications of the Surface Transportation and Uniform Relocation Assistance Act of 1987, which permitted states to increase speed limits on rural interstate highways from 55 to 65 miles per hour.
The study utilizes a rigorous time series analysis to isolate the effects of the increased speed limit on traffic fatalities and injury severity within the state of Illinois. Pfefer’s work is grounded in the objective of providing data-driven policy guidance, aiming to distinguish between transient fluctuations in traffic data and the structural impact of regulatory changes. Within the field of civil engineering and transportation safety, the report is regarded as a foundational example of post-deregulation impact assessment.
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