CMF / CRF Details
CMF ID: 10635
Install adaptive traffic signal control
Description: ATSC is a traffic management strategy in which traffic signal timings change, or adapt, based on observed traffic demand. These systems utilize increased detection to continually collect data on observed demand, and signal timings are then re-optimized based on current data.
Prior Condition: Intersections with Regular Traffic Signals
Category: Intersection traffic control
Study: Crash Modification Factors for Adaptive Traffic Signal Control: An Empirical Bayes Before-After Study, Tang et al., 2020
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 120 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.148 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.044 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -14.8 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 4.4 |
| Applicability | |
|---|---|
| Crash Type: | Angle |
| Crash Severity: | All |
| 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: | Urban and suburban |
| 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: | Signalized |
| Major Road Traffic Volume: | Minimum of 3706 to Maximum of 66387 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 111 to Maximum of 34716 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | 23080 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 7321 Annual Average Daily Traffic (AADT) |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2005 to 2018 |
| Municipality: | |
| State: | PA |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 1473 crashes after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Feb 25, 2021 |
| Comments: | This CMF is for ATSC intersections with at least three years of after period data. |
