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) | |
|---|---|
| Value: | 0.625 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.037 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 37.5 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 3.7 |
| Applicability | |
|---|---|
| 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 | |
|---|---|
| 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 | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jan 17, 2018 |
| Comments: | This CMF applies to the ramp terminals. |
