FCA = Forward Collision Avoidance & comes in various levels.
The most basic & in all Kia models post 2019 is the camera above/inside the rear view mirror assembly - also used for LKA/LFA.
More expensive versions supposedly have the ability to recognise pedestrians and also use radar to supplement the camera.
Basically it beeps at you when it thinks you're going to hit something and if you don't respond it slams on the brakes.
It sounds like a good idea but I don't believe it reacts fast enough to be of any use provided the driver is half-awake.
If everyone is using all this automation then I can see it working better but that's a few years off.
For now if you leave spaces like SCC does then you'll have someone human using them to get through traffic like the ancient arcade game "Frogger"

That unfortunately has the above-mentioned concertina effect on traffic behind.