Controversies and speed cameras: lessons learnt internationally.

Research has shown that speed cameras reduce motor vehicle speeds and crashes. Cameras have been used extensively in jurisdictions such as Victoria, Australia, and Great Britain, and much less often in the United States and Canada. They have been controversial wherever used. We describe the development of camera programs in Victoria and Britain and discuss the types of controversies that have arisen, the techniques used to address them, and what others can learn from this experience.