““contrast, provides a very weak feedback signal — when a strong signal is needed to curb habitual behavior. As Charles Duhigg, a reporter for The Times, notes in “The Power of Habit,” the rewards of a behavior — for example, driving fast without being caught or crashing — determine “how your brain decides whether to remember a habit for the future.” Speed cameras have also been shown to reduce crash and fatality rates. In 2009, Swedish researchers, looking at camera programs in Europe and Australia, found injury-causing crashes reduced by 16 percent, and fatal crashes cut by an estimated 39 percent. Research by the University of Minnesota, Public Policy Polling and others has found that a majority of people support speed””
