CMF / CRF Details
CMF ID: 10463
Increase speed limit from 55 mph to 60 mph
Description:
Prior Condition: Posted speed limit of 55 mph
Category: Speed management
Study: Speed Limit Change (55 mph to 60 mph) Safety Evaluation, Saleem et al., 2020
Star Quality Rating: | [View score details] |
Rating Points Total: | 110 |
Crash Modification Factor (CMF) | |
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Value: | 0.851 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.235 |
Crash Reduction Factor (CRF) | |
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Value: | 14.9 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 23.5 |
Applicability | |
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Crash Type: | Sideswipe |
Crash Severity: | All |
Roadway Types: | All |
Street Type: | |
Minimum Number of Lanes: | 2 |
Maximum Number of Lanes: | 2 |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | Undivided |
Minimum Speed Limit: | 60 |
Maximum Speed Limit: | 60 |
Speed Unit: | mph |
Speed Limit Comment: | |
Area Type: | Rural |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | All |
If countermeasure is intersection-based | |
Intersection Type: | Roadway/roadway (not interchange related) |
Intersection Geometry: | 3-leg |
Traffic Control: | Other |
Major Road Traffic Volume: | |
Minor Road Traffic Volume: | |
Average Major Road Volume : | |
Average Minor Road Volume : |
Development Details | |
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Date Range of Data Used: | 2012 to 2018 |
Municipality: | |
State: | MN |
Country: | |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 15 crashes after |
Sample Size (sites): | 1656 sites before, 1656 sites after |