CMF / CRF Details
CMF ID: 7714
Install automated section speed enforcement system
Description: Installation of automated speed enforcement system. Determines average speed of vehicle over a long distance.
Prior Condition: No Point-to-Point Automated Section Speed Enforcement System
Category: Advanced technology and ITS
Study: Effects on Speed and Safety of Point-to-Point Speed Enforcement Systems: Evaluation on the Urban Motorway A56 Tangenziale di Napoli, Montella, et al., 2005
Image: View the countermeasure image.
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 135 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.563 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.06 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 43.7 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 6 |
| Applicability | |
|---|---|
| Crash Type: | Single vehicle |
| Crash Severity: | All |
| Roadway Types: | Principal Arterial Other Freeways and Expressways |
| Street Type: | |
| Minimum Number of Lanes: | 6 |
| Maximum Number of Lanes: | 6 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Divided by Median |
| Minimum Speed Limit: | 80 |
| Maximum Speed Limit: | 80 |
| Speed Unit: | km/h |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | All |
| If countermeasure is intersection-based | |
| Intersection Type: | |
| Intersection Geometry: | |
| Traffic Control: | |
| Major Road Traffic Volume: | |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 2006 to 2011 |
| Municipality: | Naples |
| State: | notusa |
| Country: | Italy |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 213 crashes before, 111 crashes after |
| Sample Size (sites): | 167 sites before, 167 sites after |
| Sample Size (site-years): | 514 site-years before, 486 site-years after |
| Sample Size (miles): | 25 miles before, 25 miles after |
| Sample Size (miles): | 77 mile-years before, 73 mile-years after |
