CMF / CRF Details
Replace Incandescent Traffic Signal Bulbs with Light Emitting Diodes (LEDs)
Countermeasure ID: 2723
Description: At urban signalized intersections, incandescent traffic signal bulbs are replaced by light emitting diodes (LEDs) to improve signal visibility
Prior Condition: incandescent bulbs in use at traffic signal
Category: Intersection traffic control
Study: Analyzing the Effects of LED Traffic Signals on Urban Intersection Safety, Eustace et al., 2010
Study Type: Journal Article/Book
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 85 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.71 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.156 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -71 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 15.6 |
| Applicability | |
|---|---|
| Crash Type: | All |
| 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: | |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | Not specified |
| If countermeasure is intersection-based | |
| Intersection Type: | Not specified |
| Intersection Geometry: | Not specified |
| Traffic Control: | Signalized |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 1999 to 2007 |
| Municipality: | Middletown |
| State: | OH |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
