CMF / CRF Details
CMF ID: 7332
Improve pavement friction (Chip Seal)
Description: Chip seal treatment to improve pavement friction
Prior Condition: No Prior Condition(s)
Category: Roadway
Study: Evaluation of Pavement Safety Performance, Merritt et al., 2015
Star Quality Rating: | [View score details] |
Rating Points Total: | 110 |
Crash Modification Factor (CMF) | |
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Value: | 0.999 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.062 |
Crash Reduction Factor (CRF) | |
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Value: | |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Applicability | |
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Crash Type: | Wet road |
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: | Wet road |
Road Division Type: | All |
Minimum Speed Limit: | |
Maximum Speed Limit: | |
Speed Unit: | |
Speed Limit Comment: | |
Area Type: | All |
Traffic Volume: | Minimum of 239 to Maximum of 19533 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | 2618 Annual Average Daily Traffic (AADT) |
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 | |
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Date Range of Data Used: | 2003 to 2011 |
Municipality: | |
State: | PA |
Country: | USA |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (miles): | 570 miles before, 570 miles after |