CMF / CRF Details
Install Box Span Signal
Countermeasure ID: 8724
Description:
Prior Condition: Intersections with diagonal span signal configurations
Category: Advanced technology and ITS
Study: Safety Evaluation of Box Span Signal Configuration, Yassin et al., 2017
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 110 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.897 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.079 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 10.3 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 7.9 |
| Applicability | |
|---|---|
| Crash Type: | Other |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | |
| Maximum Number of Lanes: | 4 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | < = 4 Lanes |
| Crash Weather: | Not specified |
| Road Division Type: | All |
| 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: | Not specified |
| Intersection Geometry: | 3-leg,4-leg |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | Minimum of 3220 to Maximum of 66316 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 471 to Maximum of 53080 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | 18476 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 7094 Annual Average Daily Traffic (AADT) |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2006 to 2011 |
| Municipality: | |
| State: | MI |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 272.7 crashes before, 225.6 crashes after |
| Sample Size (sites): | 117 sites before, 117 sites after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Nov 17, 2017 |
| Comments: | The CMF is for intersection fatal and injury crashes for people at all ages |
