CMF / CRF Details
Convert minor-road stop control to all-way stop control
Countermeasure ID: 10536
Description:
Prior Condition: Intersections with stops signs on minor approaches
Category: Intersection traffic control
Study: Estimate of the Safety Effect of All-Way Stop Control Conversion in Washington, DC, Deng et al., 2020
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.68 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.0958 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 32 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 9.58 |
| Applicability |
|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| 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: | |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Not specified |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | Not specified |
| If countermeasure is intersection-based |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 3-leg,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: | 2009 to 2016 |
| Municipality: | |
| State: | DC |
| Country: | |
| Type of Methodology Used: | Before/after using comparison group |
| Sample Size (crashes): | 76 crashes before, 36 crashes after |
| Sample Size (sites): | 44 sites before, 44 sites after |
| Sample Size (site-years): | 132 site-years before, 132 site-years after |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Dec 17, 2020 |
| Comments: | CMF for injury crashes at intersections without skews. |
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