CMF / CRF Details
CMF ID: 10300
Convert at-grade intersections to Diverging Diamond Interchanges
Description:
Prior Condition: Regular diamond interchange
Category: Interchange design
Study: Development of Performance Matrices for Evaluating Innovative Intersections and Interchanges, Zlatkovic, M., 2015
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 95 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.755 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.106 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 24.5 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 10.6 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Not specified |
| 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: | |
| 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: | Roadway/roadway (interchange ramp terminal) |
| Intersection Geometry: | |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2008 to 2013 |
| Municipality: | |
| State: | UT |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 128 crashes before, 75 crashes after |
| Sample Size (sites): | 3 sites before, 3 sites after |
| Sample Size (site-years): | 10 site-years before, 8 site-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Mar 23, 2020 |
| Comments: | |
