CMF / CRF Details
CMF ID: 6842
Increase pavement marking retroreflectivity
Description:
Increase pavement marking retroreflectivity from X to Y mcd/m2/lx
Prior Condition: The same minimum in-service level for both white and yellow markings: 175 mcd/m2/lx
Category: Delineation
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.852 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 14.8 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability |
|---|
| Crash Type: | Nighttime |
| 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 30 to Maximum of 13000 Annual Average Daily Traffic (AADT) |
| Average Traffic Volume: | 2811 Annual Average Daily Traffic (AADT) |
| Time of Day: | Night |
| 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: | NC |
| Country: | USA |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 85 crashes |
| Sample Size (sites): | 234 sites |
| Sample Size (miles): | 616.8 miles |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Nov 01, 2015 |
| Comments: | This CMF applies to the scenario where retroreflectivity of the White edge lines and Yellow center line increase from 175 mcd/m2/lx and 175 mcd/m2/lx to 350 mcd/m2/lx and 225 mcd/m2/lx, respectively. |
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