CMF / CRF Details
CMF ID: 6613
Change pavement friction from 40 to SK (in friction number)
Description:
Prior Condition: No Prior Condition(s)
Category: Roadway
Study: Evaluating the Need for Surface Treatments to Reduce Crash Frequency on Horizontal Curves, Pratt et al., 2014
Star Quality Rating: | [View score details] |
Rating Points Total: | 105 |
Crash Modification Factor (CMF) | |
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Value: | |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Crash Reduction Factor (CRF) | |
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Unadjusted Standard Error: |
Applicability | |
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Crash Type: | All |
Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
Roadway Types: | All |
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: | 60 |
Maximum Speed Limit: | 60 |
Speed Unit: | mph |
Speed Limit Comment: | |
Area Type: | Not specified |
Traffic Volume: | Minimum of 14 to Maximum of 40200 Average Daily Traffic (ADT) |
Average Traffic Volume: | 1443 Average Daily Traffic (ADT) |
Time of Day: | Not specified |
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: | 2007 to 2011 |
Municipality: | |
State: | TX |
Country: | USA |
Type of Methodology Used: | Regression cross-section |
Sample Size (crashes): | 3772 crashes |
Sample Size (sites): | 386 sites |
Sample Size (miles): | 4051 miles |