CMF / CRF Details
CMF ID: 9113
Provide passing lane or climbing lane
Description: Provide passing lane or climbing lane
Prior Condition: Rural, 2-lane roads without passing lanes.
Category: Roadway
Study: Policy considerations for evaluating the safety effectiveness of passing lanes on rural two-lane highways with lower traffic volumes: Wyoming 59 case study, Schumaker et al., 2016
Star Quality Rating: | [View score details] |
Rating Points Total: | 85 |
Crash Modification Factor (CMF) | |
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Value: | 0.66 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.12 |
Crash Reduction Factor (CRF) | |
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Value: | 34 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 12 |
Applicability | |
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Crash Type: | Head on,Run off road,Sideswipe,Other |
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: | |
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 | |
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Date Range of Data Used: | 1997 to 2013 |
Municipality: | |
State: | WY |
Country: | USA |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (sites): | 9 sites before, 9 sites after |
Sample Size (site-years): | 72 site-years before, 63 site-years after |
Sample Size (miles): | 10.03 miles before, 10.03 miles after |
Sample Size (miles): | 80.24 mile-years before, 70.21 mile-years after |