CMF / CRF Details
CMF ID: 9383
Install cable median barrier
Description: Install cable median barrier
Prior Condition: Roadways without median cable barriers
Category: Roadside
Study: Crash Modification Factors for Median Cable Barriers in Tennessee, Bryant, 2018
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 75 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.07 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.1144 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 93 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 11.44 |
| Applicability | |
|---|---|
| Crash Type: | Other |
| Crash Severity: | K (fatal),A (serious injury) |
| Roadway Types: | Not specified |
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| Minimum Number of Lanes: | |
| Maximum Number of Lanes: | |
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| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
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| Area Type: | |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based | |
| Intersection Type: | |
| Intersection Geometry: | |
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| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
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| Development Details | |
|---|---|
| Date Range of Data Used: | 2003 to 2013 |
| Municipality: | |
| State: | TN |
| Country: | |
| Type of Methodology Used: | Before/after using comparison group |
| Sample Size (crashes): | 55 crashes before, 17 crashes after |
| Sample Size (sites): | 316 sites before, 316 sites after |
| Sample Size (site-years): | 1264 site-years before, 948 site-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Oct 27, 2018 |
| Comments: | This CMF is for fatal and incapacitating median related crashes. |
