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My thoughts on TACC 2019.8.5

dewittbo

Member
Jan 20, 2019
36
18
orem, utah
I was quite pleased when I realized I could use TACC on my city streets safely. It was fun to simply set my max speed, activate TACC, and let the car worry about keeping up with the traffic within the speed limit without constantly having to check the speedometer; especially once I discovered that the car would also come to a dead stop at a stop light, then start up again—as long as there was another car in front of me. There were only two things that bothered me: I felt that the car would approach a stopped car too fast, and then need to brake aggressively to come to a stop, and it would misinterpret cars that were turning from in front of me as potential collision threats and brake in an overly-aggressive manner before resuming a normal speed when they were simply making a maneuver into a turn lane.

My impressions of the TACC update with 2019.8.5 is that it has become even more overly-sensitive to cars moving into a turn lane and braking without warning in such a way as to be potentially troublesome to any car that might be following me and which would not be expecting me to brake in such a situation. Also, while on the previous update, the car would come to a stop behind a car at a stoplight in the properly-accepted distance with the top of my dashboard aligned with the bottom of the rear tires of the car in front me, it now stops about a car’s length away—too far, it seems to me. Also, whereas before, my car would wait when starting again maybe a second or so before starting to roll forward, it now waits uncomfortably longer, and then starts up much more abruptly than before and seems to have a difficult time adjusting its speed to the car in front.

As a result, I am less comfortable using TACC in town now—and don’t do so unless there is very little traffic.
 

ewoodrick

Well-Known Member
Apr 13, 2018
5,285
4,270
Buford, GA
I haven't noticed a big difference.

But since it is BETA software, I'm assuming that you have your foot on the accelerator, ready to overcome any slowdowns that occur, especially since you are aware that they do occur.
 
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lynnpt2001

Cookie Monster MX & M3
Sep 9, 2015
507
581
Greencastle PA
I second this post. Car TACC has become less smooth overall, brakes when someone comes over aggressively into your lane, never did of previous version
 

edlin303

Member
Jan 29, 2018
103
120
San Diego
Mine has gone way beyond "being responsive". It has repeatedly slammed on the breaks with no one in front of me at highway speeds. Best guess is it senses a car several lanes over that it thinks is going to merge into my lane, but in each case the car was multiple lanes away and the breaking was so abrupt that it nearly caused the car following to rear-end my X. I am barely using TACC anymore as a result. I really hope they fix this soon.
 

Ziggy2

Member
May 3, 2018
51
63
South Carolina
Totally agree. After 8 hours of highway driving this weekend, I had same concern. Brakes hard way too often at highway speeds foe no reason. Does it a lot when I engage turn signal for no apparent reason. I became very concerned about cars behind me as car dropped 20 mph in seconds with a clear lane in front of me. I had to be way more vigilant than I should have been. Did a two hour drive in my Genesis today and had no issues, very smooth like I expected.
 

Terthen

Member
May 9, 2016
346
201
San Diego
I’m experiencing the same. On a road trip now and noticed that it would brake too much when other cars were too close to my lane, thinking they were merging I guess. Obviously we want th car to recognize it but it seems overly sensitive right now. Still happy to have AP but I was very cognizant of how close other cars were following me and would turn off AP if they were close. In stop/go traffic it was braking heavily unnecessarily.

My 3 doesn’t have these issues on the latest update I’ve received.
 

dewittbo

Member
Jan 20, 2019
36
18
orem, utah
What makes me uncomfortable is when my X 'sees' another car at least a block ahead turning or crossing the road and brakes unexpectedly, startling me and anyone behind me....It is far too sensitive and I hope the software engineers come up with a tweak soon so I can go back to 'comfortable' driving....:)
 

Grassright

Member
Oct 7, 2017
179
175
Sunnyvale, CA
2018.50.6 was working so well for me. Now 2019.x is totally unusable. Along with so many other system bugs, I start to worry about software quality control of Tesla...
 

jeffro01

Active Member
Jan 30, 2013
2,693
3,157
Teller County CO
Yeah it's gotten pretty bad as of late... When in the carpool lane i have to drive with 1 foot on the accelerator or it'll phantom break constantly... It's grossly overreacting to cars in the adjacent lane and instead of moving the X over if a car is hugging the lane line it'll break like the car is pulling right in front of you...

Yet another example in the long list of examples as to why Tesla is nowhere near even remotely close to FSD...

Jeff
 

verygreen

Curious member
Jan 16, 2017
2,945
11,514
TN
Everything in Autopilot, including TACC, is beta. Even features that have been around for years. Tesla is constantly adapting and adjusting things, and TACC is certainly not a separate isolated feature.
wait-wait, don't confuse things.

When you enable autosteer - that is clearly marked at BETA in the ui. I assume everything that is NOT marked as beta in the UI is NOT beta.
 

DCGOO

Active Member
Nov 24, 2015
1,654
979
Indianapolis, IN
wait-wait, don't confuse things.

When you enable autosteer - that is clearly marked at BETA in the ui. I assume everything that is NOT marked as beta in the UI is NOT beta.

Auto-steer includes implies TACC. You cannot activate auto-steer without TACC, therefore it is included in the definition thereof. Has to be.
 

DCGOO

Active Member
Nov 24, 2015
1,654
979
Indianapolis, IN
But you can activate TACC without autosteer!

Yes you can. But it is the same TACC used with autosteer and occasionally quirky. Everything auto should be considered to be in beta, whether it displays an explicit warning or not. That is why you have to hang on firmly and stay fully engaged. It significantly reduces the driver workload, but it is far from eliminating it. I am hopeful for someday to not have to pay attention. But it is not going to be here very soon I am afraid.
 

verygreen

Curious member
Jan 16, 2017
2,945
11,514
TN
Yes you can. But it is the same TACC used with autosteer and occasionally quirky. Everything auto should be considered to be in beta, whether it displays an explicit warning or not. That is why you have to hang on firmly and stay fully engaged. It significantly reduces the driver workload, but it is far from eliminating it. I am hopeful for someday to not have to pay attention. But it is not going to be here very soon I am afraid.
If you check the car menus, autosteeer is clearly marked as BETA and gives a warning ewhen you first enable it in menu,
TACC is enabled by default and does not produce any warnings.
 

arcus

Active Member
Aug 11, 2017
1,302
965
Denton, TX
I'll chime in as well. Up to 8.4 TACC was working perfectly fine for me. Yesterday I've installed 8.5 and I had to disable TACC for the very first time on the stretch of the road I use to commute daily. It was braking for no apparent reason as soon as there was a car in adjacent lane (slightly ahead of me). It was not veering into my lane or changing lanes, just cruising along. So, it looks like TACC is far more sensitive now too.

Or does it need to "re-learn" after software update is applied?
 

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