CMF / CRF Details
CMF ID: 4797
Install wider edgelines (4 in to 6 in)
Description: Widen edgelines from 4 inches to 6 inches
Prior Condition: 4 in wide edgelines
Category: Delineation
Study: Safety effects of wider edge lines on rural, two-lane highways, Park et al., 2012
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 100 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.804 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.047 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 19.6 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 4.7 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | O (property damage only) |
| 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: | |
| 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 | |
|---|---|
| Date Range of Data Used: | 2001 to 2009 |
| Municipality: | |
| State: | MI |
| Country: | |
| Type of Methodology Used: | Time series |
| Sample Size (mile-years): | 6302 mile-years |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | May 01, 2013 |
| Comments: | Crash type also excludes intersection/interchange crashes and winter month crashes. |
