CMF / CRF Details
CMF ID: 6969
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: | 120 |
Crash Modification Factor (CMF) | |
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Value: | 1.019 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.063 |
Crash Reduction Factor (CRF) | |
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Value: | -1.9 (This value indicates an increase in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 6.3 |
Applicability | |
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Crash Type: | All |
Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
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 782 to Maximum of 25796 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | 4990 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: | PA |
Country: | USA |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 872 crashes before, 317 crashes after |
Sample Size (miles): | 218 miles before, 218 miles after |
Sample Size (miles): | 1407 mile-years before, 512 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 fatal & injury crashes excludes intersection-related and animal crashes. |