CMF / CRF Details
CMF ID: 6950
Install centerline and shoulder rumble strips
Description: Milled or rolled rumble strips.
Prior Condition: There are no existing rumble strips
Category: Roadway
Study: Safety Evaluation of Centerline Plus Shoulder Rumble Strips, Persaud et al., 2015
Star Quality Rating: | [View score details] |
Rating Points Total: | 130 |
Crash Modification Factor (CMF) | |
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Value: | 0.506 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.105 |
Crash Reduction Factor (CRF) | |
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Value: | 49.4 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 10.5 |
Applicability | |
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Crash Type: | Head on |
Crash Severity: | All |
Roadway Types: | Not specified |
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: | |
Maximum Speed Limit: | |
Speed Unit: | |
Speed Limit Comment: | |
Area Type: | Rural |
Traffic Volume: | Minimum of 154 to Maximum of 15848 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | 5290 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: | |
Municipality: | |
State: | MO |
Country: | USA |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 170 crashes before, 24 crashes after |
Sample Size (miles): | 460 miles before, 460 miles after |
Sample Size (miles): | 4238 mile-years before, 1286 mile-years after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Nov 01, 2015 |
Comments: | CMF for head-on crashes excludes intersection-related and animal crashes. |