When stuck in traffic, TACC (and autosteer) do a great job of reducing mental load...you can just sit there and let the car speed up and slow down for you. However, passengers have commented that the car is much “jerkier” when accelerating and braking than a human driver (me) would be. Putting the car in CHILL mode helps a bit, but it still tends to do some things that don’t make sense — for example, if traffic speeds up quickly and then slows down, my car will keep accelerating to close the gap with the car ahead, even after the car one or two cars ahead has started to brake, until it gets “close enough” to the next car, and then brakes hard.
TACC seems to rely solely on radar distance sensing and not on other clues (i.e., brake lights from the car ahead) to predict slowing traffic. This works fine at 70 MPH (where you don’t want to slow down until you have to), but in stop-and-go traffic it would be better for it to drive more gently and maintain a speed closer to the average, rather than constantly speeding up and slowing down. This would also help improve traffic flow behind the car by “absorbing” traffic waves, and could actually dissipate traffic jams.
I have an Aug. 2017 AP2 X100D in case that matters...
TACC seems to rely solely on radar distance sensing and not on other clues (i.e., brake lights from the car ahead) to predict slowing traffic. This works fine at 70 MPH (where you don’t want to slow down until you have to), but in stop-and-go traffic it would be better for it to drive more gently and maintain a speed closer to the average, rather than constantly speeding up and slowing down. This would also help improve traffic flow behind the car by “absorbing” traffic waves, and could actually dissipate traffic jams.
I have an Aug. 2017 AP2 X100D in case that matters...