CMF / CRF Details
CMF ID: 7572
Convert 2 lane roadway to 4 lane divided roadway
Description: Conversion of urban and rural two-lane roadways to four-lane divided roadways
Prior Condition: 2 lane roadway
Category: Roadway
Study: Evaluation of the Safety Effectiveness of the Conversion of Two-Lane Roadways to Four-Lane Divided Roadways: Bayesian vs. Empirical Bayes, Ahmed et al., 2015
Star Quality Rating: | [View score details] |
Rating Points Total: | 120 |
Crash Modification Factor (CMF) | |
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Value: | 0.236 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.072 |
Crash Reduction Factor (CRF) | |
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Value: | 76.4 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 7.21 |
Applicability | |
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Crash Type: | All |
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: | Urban |
Traffic Volume: | Minimum of 18000 Average Daily Traffic (ADT) |
Average Traffic Volume: | |
Time of Day: | |
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: | 2002 to 2012 |
Municipality: | |
State: | FL |
Country: | USA |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (sites): | 26 sites before, 26 sites after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Nov 01, 2015 |
Comments: | Applies to roadways with AADT greater than or equal to 18,000 |