Those Jersey barriers only work so well when it's a car, imagine a large SUV or semi... forget about it, the barrier becomes a ramp. Yet they do seriously slow down the vehicle, but once it breaks through, it's a whole other story. I know the article says otherwise, but, if you travel on Rt. 287 southbound, there's an impact crater from a semi that busted through one barrier right around the Morristown exit ramps.
Notice something else though, the NJTA uses the metric system, it's a pain in the ass when nobody else uses it in NJ.