That’s a report on a single study in the UK. We cannot necessarily assume that the outcome will be the same or even similar in all jurisdictions and social driving norms. The US, for instance, doesn’t have speed cameras, but the use of red light cameras has no effect in the rate of accidents at best and an increase in the rate of accidents at worse and it’s not clear what impact the introduction of such cameras to the US would have. Meanwhile the UAE does have speed cameras, but they do nothing to limit the speed of the Emirate citizens and only the threat of harsh fines, punishment, or deportation keeps the immigrant and working population in line.

While this camera was in a location which already has cameras, the claim quoted was not that “UK cameras protect UK drivers,” but one of “Cameras [in general] protect everyone” which is simply not true. Cameras have only the mechanisms necessary to record and report, they have no mechanism by which they can divert, slow, or stop a car or pedestrian and no mechanism they can use to stop an accident.