CMF / CRF Details
CMF ID: 8463
Install an intersection conflict warning system (ICWS) with post mounted signs (various messages) and flashers in advance of the intersection on major; loop on minor
Description: Install an intersection conflict warning system (ICWS) with post mounted signs (various messages) and flashers in advance of the intersection on major; loop on minor
Prior Condition: No intersection conflict warning systems
Category: Signs
Study: Multi-State Safety Evaluation of Intersection Conflict Warning Systems (ICWS), Himes et al, 2016
| Star Quality Rating: |
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| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.45 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.069 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 55 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 6.9 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | Not specified |
| Number of Lanes: | 2 |
| Road Division Type: | |
| Speed Limit: | |
| Area Type: | Rural |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | Not specified |
| If countermeasure is intersection-based | |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 4-leg |
| Traffic Control: | Stop-controlled |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | |
| Municipality: | |
| State: | MN, MO, NC |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 58 crashes after |
| Sample Size (sites): | 14 sites before, 14 sites after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jan-17-2017 |
| Comments: | CMF for 2-lane at 2-lane intersections |
