edit: corrected autopilot (cruise control) -> self driving
> I got a software update that seemed to add auto steer to my non-autopilot model y.
All (edit: new since 2019) Teslas come with autopilot. “Full self driving” is an add on.
> I tried it a few times on the highway but it seemed erratic (switching off randomly and dangerously engaging regenerative brakes in the fast lane)
“Switching off” usually means that it can’t identify the lane it’s supposed to be in. Was this some sort of a rural highway, a highway under construction, and/or a poorly maintained road?
The braking is called “phantom braking”, and (since a very good update in spring 2022) usually only occurs when there is some sort of substantial deceptive visual issue like oil lines, asphalt sealant, a reflection of the sun, or visual mirages (when the road looks shiny/reflective due to temp diffs).
For me personally, phantom braking only happens on a couple of (crappy) roads at certain spots for me, so I just don’t use AP at those spots.
In general, AP is super consistent. Other than an overdone name, it works really well. If it was just called “advanced cruise control”, people wouldn’t be shitting themselves over the feature. It’s just adaptive cruise control with lane assist, two features that many cars have, and Teslas happens to have implemented quite well (imho).
Eh… it has to be egregious.
I live in California, and I only have problems on two spots between Bakersfield and Barstow. The rest are literal construction sites with unmarked lanes.
Other than that, I have no issues 99% of the time I use AP when driving in NorCal in the Bay Area and surrounding areas (Napa/Sonoma to the north, Sacramento to the east, and SLO to the south). I use AP a lot, so I feel confident stating how reliable it is in these areas.
If someone finds that it doesn’t work for them in one of these areas, I’d almost guarantee that it’s in a specific spot for a specific reason.
Phantom braking has always been a bit of an issue -- when I first got the car, I just wouldn't use cruise control in heavy traffic, but felt ok using it once out of a city. In the past year or so, it's been so bad I'm scared to use it at all, and I've filed multiple complaints with the NHTSA. I'll be driving on I-80 through Nevada or Utah and every ~10 minutes the car will slam on its brakes. This is dry, consistently lit, consistent colors, minimal bridges casting shadows, etc.
I wish there was a way to make my cruise control "dumb"/non-adaptive just to stop the random abrupt braking in the middle of nowhere.
> I just wouldn't use cruise control in heavy traffic
Assuming you’re staying in one lane for a bit, AP actually shines in heavy traffic (especially stop and go).
> I'll be driving on I-80 through Nevada or Utah and every ~10 minutes the car will slam on its brakes.
Two points:
1. The update I spoke of was in spring 2022. AP improved a lot with that update for me. Shadows stopped triggering phantom braking. Trucks driving it adjacent opposite lanes on highways stopped triggering phantom braking. It took away the most egregious errors, imho. So if you’re talking about trips mostly before the spring 2022 update, i can believe it. If it’s after spring 2022, then…
2. Nevada can have lots of reflection mirages due to desert heat. Not sure about Utah, but it wouldn’t surprise me if that was the cause there as well (if it happened have the 2022 update).
I have my criticisms of teslas as cars and as a company, but autopilot is not one of them.
> I wish there was a way to make my cruise control "dumb"/non-adaptive just to stop the random abrupt braking in the middle of nowhere.
Agreed. This is one feature I hope that they are forced to make.
My biggest use case of it would be when it’s raining. AP still forces auto wipers when it’s raining, and it often runs too long (when there is no more rain) and/or too fast.
Of course, since I live in CA, rain is rarely an issue.
Camera can’t see ≠ I can’t see perfectly well. It’s dangerous to not have cruise control available at speeds that keep you with the flow of traffic.
Also, autopilot having a maximum speed of 85 MPH makes it essentially unusable on many interstates, where the speed limit is 80 MPH and the flow of traffic is 90 MPH.
So dumb.
Are you running an old software version? You might try bringing it in for service because what you're describing definitely doesn't seem right.
I didn’t realize early M3s didn’t have it.