CMF / CRF Details
CMF ID: 9786
Convert 2-lane undivided to 4-lane divided road
Description: The road is rebuilt and expanded from an undivided two-lane road into a divided four-lane road
Prior Condition: Undivided two-lane road
Category: Roadway
Study: An Empirical Bayes before-after evaluation of road safety effects of a new motorway in Norway, Elvik et al., 2017
Star Quality Rating: | [View score details] |
Rating Points Total: | 120 |
Crash Modification Factor (CMF) | |
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Value: | 0.251 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.049 |
Crash Reduction Factor (CRF) | |
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Value: | 74.9 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 4.9 |
Applicability | |
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Crash Type: | All |
Crash Severity: | K (fatal),A (serious injury) |
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: | All |
Traffic Volume: | |
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: | 1996 to 2015 |
Municipality: | |
State: | notusa |
Country: | Norway |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 71 crashes before, 11 crashes after |
Sample Size (sites): | 47 sites before, 47 sites after |
Sample Size (site-years): | 329 site-years before, 329 site-years after |
Sample Size (miles): | 28 miles before, 28 miles after |
Sample Size (miles): | 196 mile-years before, 196 mile-years after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Oct 27, 2018 |
Comments: | CMF for killed and injured road users |