In 2015 there were over 35,000 motor vehicle deaths in the United States alone, many of which happened on median-divided highways. The barriers on either side are usually made of a mix of concrete and steel and are meant to stop cars from either entering oncoming lanes or from rollover hazards like cliffs.
In the video below, the new guardrail is impacted by a regular-sized car, a large flatbed truck, and a full-sized passenger bus. Each one amazingly glances off the railing and is forced back into their lane with relatively little damage.
The amount of front-on damage that is avoided is incredible, and none (including the bus which is at least three times taller than the barrier) end up flipping. The barrier, which is flexible and bends on impact, seems mostly undamaged.