My Experience with Landcover Discovery SDV6 SE 2016
Adaptive Cruise Control? Every vehicle I've ever owned has had that! It carries over from one vehicle to the next - all the way from my first (a Triumph Mayflower) to the 2008 Santa Fe, and many Land Rover models in between.
It's called a "right foot" and, when attached to a suitably trained brain, it will work pretty much automatically to maintain a safe gap to the vehicle in front.
Most (sadly not all) people come equipped with one. The major problem seems to be the connection to the brain, this can be affected by fatigue, chemicals, anger, or outright stupidity, amongst other things.