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
Study: Nighttime Safety and Pavement Marking Retroreflectivity on Two-Lane Highways: Revisited with North Carolina Data, Carlson et al., 2015
Star Quality Rating: | [View score details] |
Rating Points Total: | 60 |
Crash Modification Factor (CMF) | |
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Value: | 0.852 |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Crash Reduction Factor (CRF) | |
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Value: | 14.8 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Applicability | |
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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 | |
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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 |