CMF / CRF Details
CMF ID: 9658
Convert at-grade intersections to Diverging Diamond Interchanges
Description:
Prior Condition: At-grade signalized intersections
Category: Interchange design
Study: Safety Evaluation of Diverging Diamond Interchanges Design for Intersections in Minnesota, Walls et al., 2018
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 85 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.42 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 58 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | All |
| Street Type: | |
| Minimum Number of Lanes: | |
| Maximum Number of Lanes: | |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Divided by Median |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based | |
| Intersection Type: | Not specified |
| Intersection Geometry: | 4-leg |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | Minimum of 28000 to Maximum of 40000 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 3000 to Maximum of 18000 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | 33638 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 11088 Annual Average Daily Traffic (AADT) |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2006 to 2015 |
| Municipality: | |
| State: | MN |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 304 crashes before, 37 crashes after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Oct 27, 2018 |
| Comments: | |
