CMF / CRF Details
CMF ID: 9422
Four to five lane conversion
Description:
Prior Condition: Four-lane undivided urban roadway
Category: Roadway
Study: Safety Performance Evaluation of Urban Undivided Four-Lane to Five-Lane Conversion in Louisiana, Rahman et al., 2018
Star Quality Rating: | [View score details] |
Rating Points Total: | 85 |
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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 |
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Area Type: | Urban |
Traffic Volume: | Minimum of 6800 to Maximum of 27304 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | 19463 Annual Average Daily Traffic (AADT) |
Time of Day: | All |
If countermeasure is intersection-based | |
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Development Details | |
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Date Range of Data Used: | 1996 to 2016 |
Municipality: | |
State: | LA |
Country: | United States |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 490 crashes after |
Sample Size (sites): | 9 sites before, 9 sites after |
Sample Size (site-years): | 60 site-years before, 42 site-years after |
Sample Size (miles): | 9.128 miles before, 9.128 miles after |
Sample Size (miles): | 61.056 mile-years before, 42.370 mile-years after |