CMF / CRF Details
CMF ID: 8664
Install J-Turn intersection
Description: Install J-Turn intersection
Prior Condition: At-grade intersections with full access from minor roads
Category: Intersection geometry
Study: A Study of the Traffic Safety at Reduced Conflict Intersections In Minnesota, Leuer and Fleming, 2016
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 45 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.877 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 12.3 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| 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: | 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: | |
| Intersection Geometry: | |
| Traffic Control: | |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2009 to 2015 |
| Municipality: | |
| State: | MN |
| Country: | |
| Type of Methodology Used: | Simple before/after |
| Sample Size (crashes): | 81 crashes before, 71 crashes after |
| Sample Size (sites): | 8 sites before, 8 sites after |
| Sample Size (site-years): | 19 site-years before, 19 site-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Nov 06, 2017 |
| Comments: | The study used crashes within 250 feet of the intersection, both mainlines and minor roads. |
