CMF / CRF Details
CMF ID: 7429
Installation of fixed combined speed and red light cameras
Description:
Installation of fixed combined speed and red light cameras
Prior Condition: Intersections without speed and red light cameras
Category: Speed management
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.82 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.05 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 18 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 5 |
| Applicability |
|---|
| Crash Type: | Angle,Left turn |
| Crash Severity: | All |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | 1 |
| Maximum Number of Lanes: | 2 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | 50 |
| Maximum Speed Limit: | 90 |
| Speed Unit: | km/h |
| Speed Limit Comment: | 50, 70, and 90 km/h |
| Area Type: | All |
| 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: | 2000 to 2008 |
| Municipality: | Flanders |
| State: | notusa |
| Country: | Belgium |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (sites): | 152 sites before, 152 sites after |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jun 22, 2015 |
| Comments: | CMF is for sites with 0 or 1 other intersections with speed and red light cameras are within 1500 meters. The number of crashes in the after period were not reported in this study, however, they have been recorded as 300 to give 10 points as a beneift of doubt for one or more of the following: (1) number of miles/sites in the reference/treatment group, (2) number of crashes in the references/treatment group, (3) reporting AADTs for the aggregate dataset but not for the disaggragate dataset used for CMF development. |
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