CMF / CRF Details
CMF ID: 9563
Increase speed limit from 65 mph to 70 mph
Description:
Prior Condition: Interstate system with 65 MPH
Category: Speed management
Study: Safety Evaluation of Change in Posted Speed Limit From 65 MPH to 70 MPH on Rural Virginia Interstate System, , 2018
Star Quality Rating: | [View score details] |
Rating Points Total: | 130 |
Crash Modification Factor (CMF) | |
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Value: | 0.027 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.039 |
Crash Reduction Factor (CRF) | |
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Value: | 97.3 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 3.9 |
Applicability | |
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Crash Type: | Truck related |
Crash Severity: | All |
Roadway Types: | Principal Arterial Interstate |
Street Type: | |
Minimum Number of Lanes: | 2 |
Maximum Number of Lanes: | 4 |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | |
Minimum Speed Limit: | 65 |
Maximum Speed Limit: | 65 |
Speed Unit: | mph |
Speed Limit Comment: | |
Area Type: | Rural |
Traffic Volume: | Minimum of 3279 to Maximum of 21686 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | 19687 Annual Average Daily Traffic (AADT) |
Time of Day: | All |
If countermeasure is intersection-based | |
Intersection Type: | |
Intersection Geometry: | |
Traffic Control: | |
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: | 2006 to 2014 |
Municipality: | |
State: | VA |
Country: | |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 884 crashes after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Oct 27, 2018 |
Comments: | CMF for sites with other improvements. |