So exactly how safe are these things? What kind of “fail safes” are built into them?

So I was reading this C&D Long Term Road Test on the Kia K900. Decent car, nothing special. Then I get to this part:

There were occasional nits to pick even on the highway, such as the blind-spot monitoring system that would sound an alert on empty stretches of road, and the one time the K900—with cruise control activated—initiated full panic braking, even cinching the seatbelts tight, from 75 mph for no apparent reason. That never happened again, thankfully.


WHAT??????????????? Luckily it occurred on I-90 in southeastern Montana but suppose it was someplace not so remote with traffic following?