CMF / CRF Details
CMF ID: 6857
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: Estimation of the Safety Effects of an Adaptive Traffic Signal Control System, Ma et al., 2015
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 75 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.92 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.08 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 8 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 8 |
| 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: | Urban and suburban |
| 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 6667 to Maximum of 49384 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 387 to Maximum of 19010 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | 24470 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 4944 Annual Average Daily Traffic (AADT) |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2006 to 2013 |
| Municipality: | |
| State: | VA |
| Country: | |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 626 crashes before, 150 crashes after |
| Sample Size (sites): | 47 sites before, 47 sites after |
| Sample Size (site-years): | 235 site-years before, 66 site-years after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Nov 01, 2015 |
| Comments: | |
