CMF / CRF Details
Install J-Turn intersection
Countermeasure ID: 5556
Description: Install J-Turn intersection
Prior Condition: Two way stop controlled intersection
Category: Intersection geometry
Study: Evaluation of J-turn Intersection Design Performance in Missouri, Edara et al., 2013
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 70 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.463 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 53.7 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | Principal Arterial Other Freeways and Expressways |
| 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: | 65 |
| Maximum Speed Limit: | 70 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based | |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 3-leg,4-leg |
| Traffic Control: | Other |
| Major Road Traffic Volume: | Minimum of 10326 to Maximum of 26470 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 434 to Maximum of 1389 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | 16309 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 755 Annual Average Daily Traffic (AADT) |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2004 to 2013 |
| Municipality: | |
| State: | MO |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 27 crashes before, 8 crashes after |
| Sample Size (sites): | 5 sites before, 5 sites after |
| Sample Size (site-years): | 15 site-years before, 11 site-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Aug 12, 2014 |
| Comments: | |
