This article discusses the available technology and opines that the answer to the question in the headline is that no manufacturer or carrier wants to be first for fear of losing customers. Without starting a debate on the pros and cons of safety regulations, I think this is one area in which NHTSA, the FCC or the states could facilitate adoption of life saving technology.
http://www.nytimes.com/2016/09/25/t...s-could-cut-off-drivers-so-why-dont-they.html
KNS
http://www.nytimes.com/2016/09/25/t...s-could-cut-off-drivers-so-why-dont-they.html
KNS