CMF / CRF Details

CMF ID: 2920

Implement automated speed enforcement cameras

Description:

Prior Condition: No automated speed enforcement demonstration program

Category: Advanced technology and ITS

Study: Evaluation of the Scottsdale Loop 101 automated speed enforcement demonstration program, Shin et al., 2009

 
Star Quality Rating: 4 Stars   [View score details]
Rating Points Total: 115
Crash Modification Factor (CMF)
Value: 0.14
Adjusted Standard Error:
Unadjusted Standard Error: 0.13
Crash Reduction Factor (CRF)
Value: 86   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 13
Applicability
Crash Type: Angle,Cross median,Day time,Dry weather,Fixed object,Head on,Left turn,Nighttime,Non-intersection,Parking related,Rear to rear,Right turn,Run off road,Speed related,Truck related,Vehicle/bicycle,Vehicle/pedestrian,Wet road
Crash Severity: A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Principal Arterial Other
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: All
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: 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: 2001 to 2006
Municipality: Scottsdale
State: AZ
Country:
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Sample Size (crashes): 26 crashes before, 6 crashes after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-21-2011
Comments: CMF is for "target" crashes. "Target" crashes are defined as those that occur during non-peak periods (specific to TOD). Peak periods (6AM - 9 AM and 4PM - 7PM); Non-peak periods (remaining 18 hrs for weekdays, 24 hrs for weekends and holidays). The authors of this study also experimented with producing additional CMFs from the same dataset using alternative, less reliable methods. Since this did not add new knowledge to this topic, these CMFs were not included in the Clearinghouse.