CMF / CRF Details
CMF ID: 10288
Provide 2 ft. paved shoulders with asphalt resurfacing and/or shoulder rumble strips
Description:
Prior Condition: No Prior Condition(s)
Category: Shoulder treatments
Study: An Alternative Regression-Based Approach to Estimate the Crash Modification Factors of Multiple Treatments Using Before-and-After Data, Galgamuwa, U. and S. Dissanayake., 2018
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 105 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.69 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.064 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 31 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 6.4 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | All |
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| Crash Weather: | Not specified |
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| Maximum Speed Limit: | |
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| Area Type: | All |
| Traffic Volume: | |
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| Time of Day: | All |
| If countermeasure is intersection-based | |
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| Development Details | |
|---|---|
| Date Range of Data Used: | 2009 to 2014 |
| Municipality: | |
| State: | KS |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 146 crashes after |
| Sample Size (miles): | 461 miles before, 461 miles after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Dec 07, 2019 |
| Comments: | This is a combined CMF for multiple treatments. |
