CMF / CRF Details
CMF ID: 4093
Four to five lane conversion
Description:
Prior Condition: Four-lane undivided roadway
Category: Roadway
Study: Crash Modification Factor for an Inexpensive Yet Very Cost Effective Safety Improvement: Converting Undivided Four-Lane Urban Roadways to Five-Lane Roadways, Sun et al., 2012
Star Quality Rating: | [View score details] |
Rating Points Total: | 15 |
Crash Modification Factor (CMF) | |
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Value: | 0.41 |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Crash Reduction Factor (CRF) | |
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Value: | 59 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Applicability | |
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Crash Type: | All |
Crash Severity: | A (serious injury),B (minor injury),C (possible injury) |
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: | Suburban |
Traffic Volume: | |
Average Traffic Volume: | 22000 Annual Average Daily Traffic (AADT) |
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: | 2004 to 2010 |
Municipality: | Opelousas |
State: | LA |
Country: | USA |
Type of Methodology Used: | Simple before/after |
Sample Size (crashes): | 54 crashes before, 22 crashes after |