CMF / CRF Details
CMF ID: 7951
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: | 130 |
Crash Modification Factor (CMF) | |
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Value: | 0.743 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.06 |
Crash Reduction Factor (CRF) | |
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Value: | 25.7 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 6 |
Applicability | |
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Crash Type: | All |
Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
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 | |
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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): | 377 crashes before, 220 crashes after |