My single example proved to me the systems work, but in case you are a skeptic, IIHS has now released the results of a five-year study on these systems. The study looked at accidents reported to police in 22 states and compared the crash rates of vehicles that had these systems to models that did not. The upshot is that accidents and injuries were reduced 40% by the systems. Interestingly, systems like those in many GM trucks that only alert the driver to the coming crash, but that do not auto-brake did not reduce injuries. They did still reduce crashes by 23%.
Read more at the IIHS site.
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