CMF / CRF Details
CMF ID: 9864
Coordinate arterial signals
Description: Coordination of traffic signals along an arterial cooridor
Prior Condition: No coordination between arterial signals
Category: Intersection traffic control
Study: Identifying the Safety Impact of Signal Coordination Projects along Urban Arterials Using a Meta-analysis Method, Williamson et al., 2018
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 25 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.86 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.27 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 14 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 27 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | O (property damage only) |
| 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: | |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Suburban |
| Traffic Volume: | |
| Average Traffic Volume: | 19500 Average Daily Traffic (ADT) |
| 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: | |
| Municipality: | |
| State: | IL |
| Country: | USA |
| Type of Methodology Used: | Before/after using comparison group |
| Sample Size (crashes): | 29 crashes before, 32 crashes after |
| Sample Size (sites): | 1 sites before, 1 sites after |
| Sample Size (site-years): | 1 site-years before, 1 site-years after |
