CMF / CRF Details
CMF ID: 2723
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: incandescent bulbs in use at traffic signal
Category: Intersection traffic control
| 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 |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Mar 21, 2011 |
| Comments: | The star rating for this CMF was modified from 1 to 2 stars in January 2015. The previous star rating was assigned using a sample size score based only on the crashes in the period after the countermeasure installation. The standard scoring method in the Clearinghouse is to score the sample size based on the crashes before the countermeasure installation plus the expected crashes in the after period. |
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