Subaru Eyesight goes down to zero and handles stop and go with lane centering. Though I guess provided you've started the adaptive cruise control system above the minimum speed.
It's not smooth though. Once traffic starts again, Eyesight accelerates hard and then brakes hard when it get up to the car, because it's using cruise control and trying get up to speed and there is a minimum speed (25mph? maybe 10mph? i forget) to set the cruise control.
You could try setting the acceleration curve (eco/gentle) and increase the follow distance.