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 

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

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.

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

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

After analyzing 13 international studies, the National Highway Traffic Safety Administration found that speed enforcement cameras reduce injury crashes between 20% and 25%.