So, they don't slam on the breaks at highway speed but they do actually often do things not mentioned by the article. The 2014 Audi I used to have would do dif

So, they don't slam on the breaks at highway speed but they do actually often do things not mentioned by the article. The 2014 Audi I used to have would do different things depending on the calculation it made on how close you were to crashing: 1. Pre-tension the seat belts 2. Increase the braking power (IE needs lighter push) 3. Close the side windows and roof 4. Turn on hazard lights 5. Give you a slight jerk through braking to try to warn you. etc The first one alone helps a lot. https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/811835 https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/... (13% fatality reduction) Now, most cars will do this these days, and do it using the same sensors they need to trigger air bag deployment even without ACC. I don't know of any study that tries to estimate the effects of doing it earlier like the Audi with ACC does (IE no study tries to evaluate whether the ones without ACC sensors have achieved the optimal amount of pre-tension in the time they have, which would make pre-tensioning them earlier like the ACC systems do pointless)