What critical capability does Adaptive Cruise Control (ACC) systems perform that Teetor's original concept did not?

Answer

Actively measuring the distance to the car immediately in front

ACC systems use sensors to measure the distance to the vehicle ahead, allowing them to automatically adjust speed to maintain a pre-selected following distance.

What critical capability does Adaptive Cruise Control (ACC) systems perform that Teetor's original concept did not?
inventorAutomobilemechanismcruise controlspeed control