CMF / CRF Details
CMF ID: 9107
Convert diamond interchange to Diverging Diamond Interchange (DDI) or Double Crossover Diamond (DCD)
Description: Convert a diamond interchange to a Diverging Diamond Interchange (DDI) or a Double Crossover Diamond (DCD)
Prior Condition: Conventional diamond interchange
Category: Interchange design
Study: When driving on the left side is safe: Safety of the diverging diamond interchange ramp terminals, Claros et al., 2017
Star Quality Rating: | [View score details] |
Rating Points Total: | 95 |
Crash Modification Factor (CMF) | |
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Value: | 0.625 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.037 |
Crash Reduction Factor (CRF) | |
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Value: | 37.5 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 3.7 |
Applicability | |
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Crash Type: | All |
Crash Severity: | All |
Roadway Types: | All |
Street Type: | |
Minimum Number of Lanes: | 3 |
Maximum Number of Lanes: | |
Number of Lanes Direction: | Both Directions |
Number of Lanes Comment: | Multi Lane |
Crash Weather: | Not specified |
Road Division Type: | |
Minimum Speed Limit: | 35 |
Maximum Speed Limit: | 45 |
Speed Unit: | mph |
Speed Limit Comment: | 35 - 45 mph on Crossroad |
Area Type: | Urban |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | Not specified |
If countermeasure is intersection-based | |
Intersection Type: | Roadway/roadway (interchange ramp terminal) |
Intersection Geometry: | 4-leg |
Traffic Control: | |
Major Road Traffic Volume: | |
Minor Road Traffic Volume: | Minimum of 17000 to Maximum of 38000 Annual Average Daily Traffic (AADT) |
Average Major Road Volume : | |
Average Minor Road Volume : |
Development Details | |
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Date Range of Data Used: | |
Municipality: | |
State: | MO |
Country: | |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 400 crashes after |
Sample Size (sites): | 18 sites after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Jan 17, 2018 |
Comments: | This CMF applies to the ramp terminals. |