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Autopilot fail with lane splitting

Discussion in 'Model 3' started by cstork, Jul 27, 2020.

  1. cstork

    cstork Supporting Member

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    I drive a 2 lane highway regularly where the one lane often splits into overtake zones and then merges. The autopilot generally starts in the middle and then suddenly swerves into the left lane. Using the blinker doesn't help. Then the merge isn't handled well. I always have to take it off autopilot when the lane splits and then again during the merge. I guess it is not a priority for Tesla to work on this......
     
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  2. LACALawyer

    LACALawyer Banned

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    No no, the SINGLE MOST important thing to the ENTIRE Tesla organization is tracking down that ONE stretch of highway that YOU are having a problem with and solving it IMMEDIATELY.

    Why would you think otherwise?
     
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  3. MentalNomad

    MentalNomad Member

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    This is a fairly frequent problem. The autopilot tries to center in lane, but when a lane is splitting into two, it often moves to the center of the widened lane and then jumps out of the center abruptly when the new lane divider appears in the middle.

    I'd much prefer if it stuck to either the right of the left lane marker when such a split begins.

    Some areas where this happens tome have improved over the many version updates I've had...others have not.

    It used to also have a problem when lanes merged... It would try to "center" into the wider section of road where two lanes have merged, only to have to come back into line shortly later. This problem has mostly been resolved.
     
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  4. rickdogg82

    rickdogg82 Member

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    It is not a unique stretch of road.
     
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  5. totoro722

    totoro722 Supporting Member

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    My experience is that Autopilot prefers going to the left in such a situation, which can be pretty abrupt when the transition from one to two lanes is fairly short and the new lane is on the left. Most situations where the lane splits I expect Autopilot to take my car left and once both lanes are established I just make a lane change to the right if that is the lane I want. If that is not going to be practical, I will wrestle the steering wheel to the right and the car drops out of Autopilot, but that can be easily restarted.

    IMO, this is improved behavior over what existed before where Autopilot did not seem to have a lane preference and would center as the lane widened, then suddenly lurch left or right. Having it mostly follow the left side lane line is much smoother.
     
  6. tpoltron

    tpoltron Member

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    Most of the time AP handles this OK now fo me - though still not as smooth as it should.
    More than 6 months ago it would freak out over such lane splits, hunting back and forth or just blaring the warning that you had to take over - so much improved, even if not yet perfect.
     
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  7. PittCaleb

    PittCaleb Member

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    Not sure why the pushback there... This is a big issue for me. I travel on a lot of road that split into 2 lanes and this is a major frustartion.

    It's not about the OPs specific road, it's everywhere where lanes widen from 1 into 2.

    FTR, "lane splitting" is something motorcyclists so. Let's find a different term to use here.
     
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  8. JBT66

    JBT66 Member

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    This is a problem on all sorts of roads. Not just the OPs. so yeah it needs to fixed. Tesla should be trying to solve on a global scale.

    Lane splitting seems like a reasonable term as thats what the car attempts to do for a few seconds then erratically corrects or freaks out AP and asks for manual take over.
     
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  9. Puddles

    Puddles Member

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    This has been one of the most enduring issues. If you think about it, you can see why. Often, if a lane splits, it’s to add a turn lane. If you rely on a simple left or right bias, as in “just stay to the center”, you get into trouble. I would not want to find myself barreling down a turn lane, left or right, with the car thinking it was a through lane. We have all seen those videos. That the issue is so persistent is an indication that it has no easy answer.
     
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  10. bxr140

    bxr140 Active Member

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    That's a great point. There's no need for Autopilot to have to deal with splitting or merging lanes.
     
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  11. SlimJim

    SlimJim Member

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    On my commute, I disengage and re-engage or I stay in the lane that doesn't have to deal with it.
     
  12. sduck

    sduck Mr. Duck

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    In areas where autopilot has shown to consistently have problems with, take over and drive it yourownself. No need to risk your life.
     
  13. Kabillyhop

    Kabillyhop Member

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    Toronto
    I used to experience this problem frequently, but have not seen it after a recent update a few weeks back. It now chooses the correct lane every time, at least on the roads I drive. I think it was with the 2020.24 updates that the problem went away for me.
    Not to say that the problem has been corrected, just that it has been minimized. We all drive different roads.
     
  14. Wnuk

    Wnuk Member

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    I encounter this frequently and just disengage autopilot. FSD still has a ways to go.
     
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  15. Michelle_eriw

    Michelle_eriw Member

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    This often happens on hills when there's a passing lane on the uphill portion. It's not just one stretch of highway. There are many instances of this on US 93 between Phoenix and Las Vegas as just one example. I don't see it as much of a problem, though, as the OP said in the last sentence of his post.
     
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  16. CharleyBC

    CharleyBC Active Member

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    Yep, weird stuff like this on both splits and merges. I think it has gotten incrementally better over the past two years, but it's not all tidy yet.

    This is why so many non-Tesla drivers think so many Tesla drivers drive drunk.
     
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  17. Ericsch

    Ericsch Member

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    Oct 3, 2014
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    Location:
    Santa Barbara, CA
    Just the other day, under similar conditions (1-to-2 lanes) I noticed a notification at the bottom of the drivers screen (Model S) saying something like "use small amount of force on steering wheel to select which way to go" Or something similar. It was only there for a second, so I couldn't read it carefully. Has anyone else seen this notification?
     
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  18. Puddles

    Puddles Member

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    Have not seen this but it would be VERY welcome and useful.
     
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  19. john5520

    john5520 Member

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    I could see where the 3d camera view in the coming re-write could help in a situation like this.
     
  20. TomT

    TomT Technical Maven

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    Location:
    NE Georgia
    We have a number of such roads here too and it handles all of them equally poorly...

     
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