CMF / CRF Details
CMF ID: 4729
Install edgeline pavement markings on narrow, rural, two-lane roads
Description: Install edgeline pavement markings on narrow (less than 22 ft.), rural, two-lane roads.
Prior Condition: No edgeline pavement markings on roadway; narrow two-lane road less than 22 ft.
Category: Delineation
Study: Safety Improvement from Edge Lines on Rural Two-Lane Highways, Sun and Das, 2011
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 55 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.78 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.144 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 22 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 14.4 |
| Applicability | |
|---|---|
| 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: | Undivided |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 2100 to Maximum of 31810 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 | |
|---|---|
| Date Range of Data Used: | 2005 to 2009 |
| Municipality: | |
| State: | LA |
| Country: | USA |
| Type of Methodology Used: | Simple before/after |
| Sample Size (crashes): | 1057 crashes before, 318 crashes after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | May 01, 2013 |
| Comments: | Analysis method was a before-after study that accounted for traffic volume. |
