Interestingly enough on Friday last week here in Colorado, I got to witness an accident on C-470 near Kipling Street just 1/2 mile in front of me where a car tried to move into the fast lane but never checked that there was already a car coming up in the fast lane. Well the car coming up swerved and spun out hitting the center cable restraint system. Since I witnessed the whole thing I had to stick around and help the injured as well as provide a statement to police. As I stated before that section of highway has the cables, BUT I had a closer evaluation after it was determined the people involved were okay. The rail support system is vastly different than those in that Michigan picture.
First off the cable bars to the ground are smaller and upon impact, they actually broke away at the base to cushion the blow (similar to the way the "new boards" are in professional sports like hockey, they gave to cushion) keeping the car on this side of the intersection. Secondly, they start at about 18" off the ground and they had three cables, each spaced by about 8' above that. That was it!
I will say witnessing an accident first hand like that, you could see where if the car had crossed the intersection, it would have hit others head on and caused a lot more damage, maybe loss of life. So if properly executed, those rail systems have some merrit, hence I slightly retract some of what I said beforehand.
However saying this and looking at those pictures there from Michigan, that MI installation appears to be quite different from what I saw out here. Those in Michigan are way, way higher and look to be much more drawn for tension. It is very sad as it does not bring a life back, but we need to learn from and do something about these tragedies, otherwise the person dies in vain. Someone in Michigan should be seriously looking into that cable system as it does not look right. Again, my condolences to the family.