it's a bit like active RFID as opposed to normal RFID, you can check and verify their position by other sensors like Lidar. Encryption procotol usually makes spoofing unlikely.
This is a bit like the scene where C3PO says to R2D2 as it beeps and burbles at in when they are lost in the desert
"Don't get technical with me!" and walks off in a huff....
My new car has front facing Radar (no idea what kind) a little black block in a gap in the front grille.
On adaptive cruise mode it will track the vehicle in front, keep pace, stop and start and oddly if the car in front turns off to the left, it will brake then too, even though the vehicle is travelling away not towards me.
How odd! and others with different makes that have Radar fitted report similar results.
It will also brake suddenly if something like a crisp packet blows across the road (off the ground) in front of you, still at least one low flying pheasant has been spared the fate of becoming a bonnet mascot.
The auto self parking is something I find so disturbing I tend not to use it.
If the vehicle behind you has parked on the pavement you will too to align with it!
And the Sat Nav.. my goodness! it's the first one I have ever had, and never even wanted, so I decided to give it a try.
Fabulous entertainment if you like travelling down tiny Devon lanes cleaning both wing mirrors at the same time in the vegetation.
Ignoring the multitue of warning beeps from the 14 proximity sensors providing in car entertainment and a spectacular light show on the larger of the two screens (cancelling the navigational map display as it does so)
I don't mind narrow lanes, but imagine some poor soul who hasn't driven the million plus miles I have finding themselves in this situation just after passing their test and having to rely on it?
They must wonder if they will ever get home again!
Then there are the voice messages like "time you took a rest" and "you are running low on fuel, would you like recommendations on a local filling station??"
It's the first car I've had that nags me.
Any more of this and the next one I get I shall simply tell it to make the journey without me and give me a report when it gets back, as I've decided to go on my Ebike instead.