The first
Mitsubishi's 1995 Diamante in Japan had radar-based ACC — too early for the US market and limited in capability. The first American car to ship a real ACC was the 2000 Lexus LS 430, with laser-based sensing.
The rollout
Through the 2000s, ACC trickled down from luxury into mainstream — Honda Accord, Toyota Avalon, Ford Taurus. By 2018, every major automaker offered ACC as standard or near-standard equipment via packages like Toyota Safety Sense, Honda Sensing, and Subaru EyeSight.
The federal moment
In 2024, NHTSA finalised a rule mandating automatic emergency braking on all new passenger vehicles by 2029 — which effectively requires the same radar/camera fusion that powers ACC. The two technologies became inseparable.
The point
Adaptive cruise was the first piece of true driver assistance — a system that perceives the world rather than just maintaining a setpoint. Once the car can see the car in front, the path to lane-keeping, traffic-jam assist and full hands-free highway driving (Super Cruise, BlueCruise) is just incremental sensor fusion.