While studies have examined the effects of speed cameras, few have looked specifically at the relationship of speed cameras and total number of MVCs while also accounting for confounding variables.
This study evaluated a very specific and defined segment of Arizona interstate that contained speed cameras for a given period of time and attempts to answer the question “Did highway speed cameras reduce the number of MVC in Arizona?” Five critical confounding variables were eliminated in this comprehensive study looking at pre, during and post placement of fixed speed cameras. Our data did not show any statistical increase or decrease in total number of MVC with speed cameras. This study did not address injuries or fatalities. Although, speed cameras did not change the incidence of collisions in this study, it will be important to see if they affect injury severity independent of incidence. Further studies are needed to examine the effect speed cameras have on injury severity, admissions to trauma centers and hospital costs independent of total number of MVC.