How it works is not nearly as important as what it does. The "how" involves distance sensors similar to radar guns, computers, and algorithms. The "what" that the driver needs to know is that it will slow the car down automatically if the car see's a vehicle in front of it getting too close, and match that cars speed. Typically the car will then speed back up to the speed set by the driver when it no longer sees that obstacle a.k.a. that car exited, sped up, or you changed lanes.
How it works is not nearly as important as what it does. The "how" involves distance sensors similar to radar guns, computers, and algorithms. The "what" that the driver needs to know is that it will slow the car down automatically if the car see's a vehicle in front of it getting too close, and match that cars speed. Typically the car will then speed back up to the speed set by the driver when it no longer sees that obstacle a.k.a. that car exited, sped up, or you changed lanes.