CMF / CRF Details
CMF ID: 4897
Replace Incandescent Traffic Signal Bulbs with Light Emitting Diodes (LEDs)
Description: At urban signalized intersections, incandescent traffic signal bulbs are replaced by light emitting diodes (LEDs) to improve signal visibility
Prior Condition: Signal heads at signalized intersections had incandescent bulbs
Category: Intersection traffic control
Study: Safety Evaluation of Converting Traffic Signals from Incandescent to LED Bulbs, Srinivasan et al., 2013
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 90 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.177 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.182 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -17.7 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 18.2 |
| Applicability | |
|---|---|
| Crash Type: | Rear end |
| Crash Severity: | All |
| 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: | All |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | Night |
| If countermeasure is intersection-based | |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 3-leg |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | 25628 (Total) Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | 25628 (Total) Annual Average Daily Traffic (AADT) |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2005 to 2010 |
| Municipality: | Charlotte |
| State: | NC |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 54 crashes before, 49 crashes after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Aug 01, 2013 |
| Comments: | |
