CMF / CRF Details
CMF ID: 10376
Road diet (Convert 4-lane undivided road to 2-lanes plus turning lane)
Description:
Prior Condition: Urban 4-lane undivided roadway
Category: Roadway
Study: Investigating Safety Impact of Center Line Rumble Strips, Lane Conversion, Roundabout and J-Turn Features on Louisiana Highways, Sun and Rahman, 2019
Star Quality Rating: | [View score details] |
Rating Points Total: | 125 |
Crash Modification Factor (CMF) | |
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Value: | 0.613 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.125 |
Crash Reduction Factor (CRF) | |
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Value: | 38.7 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 12.5 |
Applicability | |
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Crash Type: | Non-intersection |
Crash Severity: | All |
Roadway Types: | Not specified |
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: | Undivided |
Minimum Speed Limit: | |
Maximum Speed Limit: | |
Speed Unit: | |
Speed Limit Comment: | |
Area Type: | Urban |
Traffic Volume: | Minimum of 8333 to Maximum of 13900 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | |
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: | 2005 to 2016 |
Municipality: | |
State: | LA |
Country: | USA |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 60 crashes before, 40 crashes after |
Sample Size (sites): | 4 sites before, 4 sites after |
Sample Size (miles): | 3.92 miles before, 3.92 miles after |