CMF / CRF Details
CMF ID: 8020
Install shoulder rumble stripe, widen shoulder from 0 to 2 feet, and pavement resurfacing
Description: A combination of three countermeasures, including shoulder rumble stripe, shoulder widening from 0 to 2 feet, and pavement resurfacing
Prior Condition: Roadway without paved shoulder
Category: Shoulder treatments
Study: Development of Crash Modification Factors for Combined Treatments on Rural Two-lane Roads, CH2M Hill, 2015
Star Quality Rating: | [View score details] |
Rating Points Total: | 80 |
Crash Modification Factor (CMF) | |
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Value: | 0.918 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.054 |
Crash Reduction Factor (CRF) | |
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Value: | 8.2 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 5.4 |
Applicability | |
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Crash Type: | All |
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: | |
Minimum Speed Limit: | |
Maximum Speed Limit: | |
Speed Unit: | |
Speed Limit Comment: | |
Area Type: | Rural |
Traffic Volume: | Minimum of 8000 to Maximum of 17223 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | |
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: | 2004 to 2013 |
Municipality: | |
State: | MO |
Country: | |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (sites): | 885 sites before, 885 sites after |
Sample Size (site-years): | 8850 site-years before, 8850 site-years after |