Thirty five studies met the inclusion criteria. Compared with controls, the relative reduction in average speed ranged from 1% to 15% and the reduction in proportion of vehicles speeding ranged from 14% to 65%. In the vicinity of camera sites, the pre/post reductions ranged from 8% to 49% for all crashes and 11% to 44% for fatal and serious injury crashes. Compared with controls, the relative improvement in pre/post injury crash proportions ranged from 8% to 50%.
Authors' conclusions: Despite the methodological limitations and the variability in degree of signal to noise effect, the consistency of reported reductions in speed and crash outcomes across all studies show that speed cameras are a worthwhile intervention for reducing the number of road traffic injuries and deaths. However, whilst the the evidence base clearly demonstrates a positive direction in the effect, an overall magnitude of this effect is currently not deducible due to heterogeneity and lack of methodological rigour. More studies of a scientifically rigorous and homogenous nature are necessary, to provide the answer to the magnitude of effect.
Edit 2: That being said, speed cams are objectively helpful aren't the sole tool we should be using. Traffic calming is enormously beneficial and cost-effective for making places with roads safer for drivers and pedestrians.
If speed cameras are less biased than humans when issuing tickets, I see them as a fairer method of speed enforcement.
Also safer for BIPOC individuals to receive a ticket in the mail, as opposed to a roadside traffic stop.
Reminds me of a past mayor of the city I live in. One of his talking points was too get rid of the speeding cameras in the city. He came into office and did a photo op covering the first camera. A few weeks later his son died due to an accident caused by wreckless speeding driver in City center.
Yeah, can you imagine? Cars actually driving below speed limits and not risking everyone's lives? Good thing this buddy makes side we can all speed like idiots instt