I typically do a quick push-forward then pull-back on the cruise control stalk. This disengages both, then reengages TACC. The problem with this is that the car will only re-engage TACC with the set speed equal to what you had it on before if your speed is at or near that speed. If your speed is quite a bit less than the set speed (like if you're in congested traffic), then the set speed upon re-engagement becomes speed limit + offset.
Another item that I've always found problematic is that disengaging autosteer by turning the wheel can leave you in an unexpected situation: If you're at your set cruising speed and disengage autosteer by turning the wheel, then TACC remains on, set to your same cruising speed, which is expected. But say you're in stop-and-go traffic, with autosteer engaged, and your set speed is well above your actual speed (e.g. set speed at the speed limit of 65 MPH, but actual traffic speed is stop-and-go). In this situation, what I've frequently seen this do is:
- Set speed = 65, actual speed = 10, autosteer engaged, following the car ahead.
- Car ahead changes lanes or exits.
- Autosteer attempts to follow that car, but I want to remain in the lane, so I steer the wheel to stay in the lane, disengaging autosteer.
- TACC remains on, set to 65 MPH.
- When the car gets out of the way due to his exit or lane change, now there's a large gap ahead to the next car.
- My car then accelerates rapidly.
I've gotten used to this and I expect it, but this can easily take a new Tesla driver by surprise. My recommendation (to
@JonMc ) would be:
- If you turn the wheel to disengage autosteer, TACC remains on only if actual speed is within 20 MPH of set speed.
- If actual speed is more than 20 MPH below set speed, turning the wheel should disengage both autosteer and TACC.
I think this would be safer for the driver, especially those drivers who have limited autosteer experience.
