CMF / CRF Details
CMF ID: 8655
Convert a T intersection into a continuous green T intersection
Description: The continuous green T intersection is characterized by a channelized left-turn movement from the minor street approach onto the major street, along with a continuous through movement on the major street. The continuous flow through movement is not controlled by the three-phase traffic signal that is used to separate all other movements at the intersection. Rather, the continuous through movement typically has a green through arrow indicator to inform drivers that they do not have to stop.
Prior Condition: Signalized T Intersection
Category: Intersection geometry
Study: Safety Evaluation of Continuous Green T Intersections: A Propensity Scores-genetic Matching-potential Outcomes Approach, Wood and Donnell, 2016
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 105 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.958 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.106 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 4.2 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 10.6 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | All |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 8 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | 15 |
| Maximum Speed Limit: | 60 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | |
| 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 |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | Minimum of 8300 to Maximum of 59000 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | Minimum of 500 to Maximum of 40000 Annual Average Daily Traffic (AADT) |
| Average Major Road Volume : | 30951 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 9421 Annual Average Daily Traffic (AADT) |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2008 to 2013 |
| Municipality: | |
| State: | FL,SC |
| Country: | USA |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 2339 crashes |
| Sample Size (sites): | 60 sites |
| Sample Size (site-years): | 297 site-years |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Nov 06, 2017 |
| Comments: | The study used weighted negative binomial regression with the genetic matched data. |
