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Just the Facts:
Speed Safety Cameras
Insurance Institute for Highway Safety
In Montgomery County, MD, drivers traveling more than 10 mph above the posted speed limit declined by about 70% at locations with speed safety cameras.  Resident support jumped from 58% to 64% six months after the installation of speed enforcement cameras.

Demonstration of Automated Speed Enforcement in School Zones in Portland, OR 
National Highway Traffic Safety Administration
In low-speed school zones in Portland, OR, the number of vehicles exceeding the speed limit by over 10mph reduced by two-thirds after the installation of speed safety cameras

Insurance Institute for Highway Safety
In the District of Columbia, the number of vehicles exceeding the speed limit by over 10 mph reduced by approximately 82% after the installation of speed enforcement cameras.

City of New Orleans
The City of New Orleans found and 84% reduction in speed violations eight months after the implementation of a speed enforcement program.

Evaluation of the City of Scottsdale Loop 101 Photo Enforcement Demonstration Program
Arizona State University
In Scottsdale, the total number of target crashes decreased by 44% to 54%, the total number of injury crashes decreased by 28% to 48%, and the number of property damage only crashes decreased by 46% to 56% after the installation of speed safety cameras.

Automated Enforcement: A Compendium of Worldwide Evaluations of Results
National Highway Traffic Safety Administration
After analyzing 13 international studies, the National Highway Traffic Safety Administration found that speed enforcement cameras reduce injury crashes between 20% and 25%.
Case Study: 
Speed Safety Cameras in Scottsdale, Arizona
A speed safety camera pilot program established six speed enforcement cameras along an 8-mile stretch of highway in Scottsdale, Arizona.  The cameras photographed vehicles and cited drivers traveling at least 11 mph above the posted speed limit. 
 
The results showed a drastic change in driving behavior:
 
86%
Reduction in drivers traveling 11+ mph above posted speed limit
 
7 mph
Reduction (from 70mph to 63mph) in average speed on the photo-enforced highway
 
 
Following the 6-month trial, the cameras were removed and researchers observed:
 
Average speeds return to 69 mph and drivers speeding over 11+ mph above the speed limit increase by 83%
 
"These results show how the combination of highly visible warning messages and camera enforcement deters speed violations...  The program wasn't about tickets.  The goal was to drive down violations by sending a message that speeding is unacceptable." 
Richard Retting 
 Senior Transportation Engineer
Insurance Institute for Highway Safety
 
 
 Source: "Special Issue: Speed," Insurance Institute for Highway Safety Status Report, January 2008.