CMF / CRF Details
Install Dual Left Turn Lanes (DLTLs)
Countermeasure ID: 11890
Description:
Prior Condition: No Prior Condition(s)
Category: Intersection geometry
Study Type: Journal Article/Book
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 40 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.073 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.055 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -7.3 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 5.5 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | O (property damage only) |
| Roadway Types: | Principal Arterial Other Freeways and Expressways, Principal Arterial Other, Minor Arterial, Major Collector |
| Street Type: | |
| Minimum Number of Lanes: | |
| Maximum Number of Lanes: | |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | |
| Road Division Type: | |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | |
| 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 21000 to Maximum of 69000 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | 44667 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2005 to 2022 |
| Municipality: | |
| State: | NC |
| Country: | |
| Type of Methodology Used: | |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jan 01, 1970 |
| Comments: | This CMF is for 18 DLTL install sites with protected phasing throughout |
