CMF / CRF Details
CMF ID: 2000
Implement left-hand merge and downstream lane shift (Iowa weave)
Description: Compared to conventional right-lane work zone lane closure
Prior Condition: No Prior Condition(s)
Category: Work zone
Study: Crash Analysis of Work Zone Lane Closures with Left-Hand Merge and Downstream Lane Shift, See et al., 2009
Star Quality Rating: | [View score details] |
Rating Points Total: | 50 |
Crash Modification Factor (CMF) | |
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Value: | 0.54 |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Crash Reduction Factor (CRF) | |
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Value: | 46 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Applicability | |
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Crash Type: | All |
Crash Severity: | All |
Roadway Types: | Principal Arterial Interstate |
Street Type: | |
Minimum Number of Lanes: | 4 |
Maximum Number of Lanes: | 4 |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | |
Minimum Speed Limit: | |
Maximum Speed Limit: | |
Speed Unit: | |
Speed Limit Comment: | |
Area Type: | Rural |
Traffic Volume: | Minimum of 20120 to Maximum of 35864 Annual Average Daily Traffic (AADT) |
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: | 2000 to 2005 |
Municipality: | |
State: | AR |
Country: | |
Type of Methodology Used: | Non-regression cross-section |
Sample Size (sites): | 10 sites |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Dec 01, 2009 |
Comments: |