CMF / CRF Details
10-ft to 60-ft conversion (median width)
Countermeasure ID: 5291
Description: Convert a 10-ft traversable median to a 60-ft traversable median
Prior Condition: Median width = 10ft
Category: Access management
Study: NCHRP Report 633: Impact of Shoulder Width and Median Width on Safety, Stamatiadis et al., 2009
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 95 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.62 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
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| Value: | 38 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
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| Applicability | |
|---|---|
| Crash Type: | Multiple vehicle |
| Crash Severity: | All |
| Roadway Types: | All |
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| Minimum Number of Lanes: | |
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| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Divided by Median |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
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| Speed Limit Comment: | |
| Area Type: | Not specified |
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| If countermeasure is intersection-based | |
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| Development Details | |
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| Date Range of Data Used: | |
| Municipality: | |
| State: | CA,KY,MN |
| Country: | |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (mile-years): | 14897 mile-years |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Dec 02, 2013 |
| Comments: | |
