I agree. But they are the most commonly encountered culprits in my experience. Interesting that you have observed with other similarly shrowded vehicles.
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Cruise control no longer safe
- Thread starter Giri99
- Start date
I agree. But they are the most commonly encountered culprits in my experience. Interesting that you have observed with other similarly shrowded vehicles.
Drew57
Active ember
I travelled M6/M5/M42/M40 today (collecting family member from medical treatment) & had three instances down & one back. The worst was M5 crossing Junction 1 with very rapid deceleration from 70 to 30 even though my car settings are for 'current speed' where a normal car would continue at that speed. One of the others was with a curtain sided lorry but quite gentle.
Driving with foot hovering over the accelerator is quite uncomfortable on long journeys so I turn Autopilot off more than on.
Have you seen verygreen's videos showing radar reflection clouds when passing under bridges? And another where some people walking around well to the left seemed to have a cluster of reflections mimicking their movement but more central in the visualisations?
I'll see if I dig up examples. They are from some time ago, but not much changed in car behaviour in this regard since then.
Thanks I'd be interested.. I had one with a tall fir tree on the way to Huntly, still got that saved on the USB. At that time I thought this was its shadow on the road causing the problem.
I can't say it isn't shadows. Enough people mention shadows seeming to be linked to unexpected braking, but presumably in order to have a shadow you need something to cast the shadow.
MrBadger
Badger out
My experience of AP and a couple of bridges on M3 is that the phantom braking events only occur on days where a distinctive shadow is cast. Same bridges, different lighting, different AP/TACC behaviour.
Then maybe it is a mix of radar and visual, and a strong shadow in the right place relative to the bridge structure gives the false response? I believe that is likely a different scenario to flapping curtain sides etc, but both examples of the present system obviously failing under certain circumstances.
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MarioG
Member
I have the model 3 2020, updating always the software. Very bad experience with the TACC as well.
I find it unreliable and dangerous the way it is at the moment. I have many bad examples but I will mention the one that shocked me mostly: I was driving in the highway about 120km/h and passed under a bridge. It was during the day so there was some shadow under the bridge on the road. The car decelerated massively. I believe had a car being behind me it could have led to a potential problem.
I decided not to use it any more.
Tesla needs to fix that asap.
I find it unreliable and dangerous the way it is at the moment. I have many bad examples but I will mention the one that shocked me mostly: I was driving in the highway about 120km/h and passed under a bridge. It was during the day so there was some shadow under the bridge on the road. The car decelerated massively. I believe had a car being behind me it could have led to a potential problem.
I decided not to use it any more.
Tesla needs to fix that asap.
MrBadger
Badger out
I am almost certain that no one type of sensor is being used as a single point of reference.
With FSD city streets, I heard someone (I believe a beta tester) actually say that radar was not being used for city streets FSD (so not the same circumstances as being discussed here and im most certainly not implying that radar is not used for highways) although I cannot recall who/where to find it or yet to notice a second source. Someone did speculate that vision and AI was primarily used with other sources as confirmation, but I cannot recall if other sources meant maps or extended to other sensors such as radar. There were several examples where predictions were wrong such as the car predicting a circular roundabout rather than carpark layout and another where it was visualising a phantom dual carriageway where the other carriageway was actually not there. Hmmmm, phantom objects... where have I seen that before?
Likewise. Especially at speed.
However at slow speed (ultrasonics) it could be single sensor. And in the case of certain emergency behaviour, I can imagine maybe basing a decision on a reduced sensor set.
Edit: Not forgetting, of course, those stationery vehicles on dual carriageways (delivery trucks, breakdowns.....) that don't appear to be responded to at all. There are clearly multiple feedback / control envelopes outside of which these systems can't make valid / reliable decisions.
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+1 on many of the things already said.
Cruise control is one of the worst aspects of Tesla ownership. I would much prefer the option of a dumb cruise control whilst Tesla get the performance of the current system to a minimum safe level.
Cruise control is one of the worst aspects of Tesla ownership. I would much prefer the option of a dumb cruise control whilst Tesla get the performance of the current system to a minimum safe level.
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kelvin 660
White SR+ with LFP battery
TACC and Autopilot is fine if you always drive in the slow lane on motorways.
Improves the cars range also... haha
Improves the cars range also... haha
Jason71
Well-Known Member
I did a long journey recently in this bad weather we have been having and not a single incident with bridges but have had it in sunny weather so I also think shadows or the rapid change in light levels, which is essentially the same thing, are a factor.
I am also with others in thinking that curtain sider HGV's seem to be worse for phantom braking than any other type of vehicle
I am also with others in thinking that curtain sider HGV's seem to be worse for phantom braking than any other type of vehicle
LongRanger
Active Member
Wonder what happens if the Dragon/Falcon rocket shenanigans gets a reflection off a cloud as it launches into the atmosphere. It sure as heck shouldn’t be phantom braking on the way up.
There's your obvious solution - disable the brakes and if you do have to stop then spin the tesla 180 and shove your foot down!
MrBadger
Badger out
What conditions to you notice it better/worse than others?
I'm not aware that things get recalibrated after an update, but almost certainly functionality changes from release to release as Tesla change and/or compare operation from one version to another even though no mention in the release notes.
