A quick google shows that Citroen, Ford & Volvo do not automatically, adjust the speed with info from the ISA, even in the Volvo, the driver has to activate the system to react against the accelerator pedal ,it doesn't slow the car automatically there is a lot of click bait B.S/misinformation about ISA, but it does not function automatically, it's just a warning system, with very few cars that will slow or speed the vehicle up, for those capable of such things, the driver must activate the function first