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[UK Poll] Does your car Change Speed for Speed Limits ?

Discussion in 'The UK and Ireland' started by VanillaAir_UK, Sep 11, 2020.

?

Does your vehicle respond to Speed Limit changes? GPS/Map or Speed Signs

  1. No. I have never had its change speed

    10.9%
  2. No. I have only seen it change speed when following another vehicle

    7.3%
  3. No. But I have seen it change speed when cornering or following another vehicle

    12.7%
  4. Yes. My car has occasionally slowed when it detects a speed limit change

    18.2%
  5. Yes. My car consistently slows when it detects a speed limit change

    21.8%
  6. I never use TACC or Autopilot so never use this function

    0 vote(s)
    0.0%
  7. Yes. My car slows and speeds up for speed limit changes

    29.1%
  1. VanillaAir_UK

    VanillaAir_UK Moderator UK and Ireland

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    #1 VanillaAir_UK, Sep 11, 2020
    Last edited: Sep 11, 2020
    There is some confusion about whether, when on TACC (traffic aware cruise control or Autopilot) the car changes speed for speed limits - whether GPS/Maps or the new visual speed sign detection.

    Officially, "When cruising at the speed limit, the cruising speed does not change when the speed limit changes". But it will adjust its speed "When cruising behind a detected vehicle," and "when entering and exiting [some] curves" (my italics).

    upload_2020-9-11_8-0-3.png upload_2020-9-11_8-1-59.png

    However some suggest that their vehicle adjusts its speed based wholly on GPS/Map based or the new (2020.36.x) visual speed sign recognition.

    How does your vehicle behave? Have you found any settings that control this? Is it totally reliable/consistent? Has it ever slowed in time for the change in speed limit to remain legal?


    Apologies for the disjointed poll options. I accidentally posted the poll prematurely, it did not allow me to delete and my edit options were limited.
     
  2. stonecoldrmw

    stonecoldrmw Member

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    Positive that mine has changed speeds
     
    • Like x 1
  3. OfficialMark_H

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    Somerset UK
    What about yes it does adjust speed limit, but only about 5 seconds after passing the sign?
     
    • Like x 5
  4. NorfolkMustard

    NorfolkMustard Active Member

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    Definitely. Only occasionally, but consistently at certain places. Buy me a gopro and mount and I'll show it :)

    Anecdotally, it's been where there are speed cameras nearby too. Perhaps it only does it where it has a very high confidence :- map + fleetspeed ? and with it now reading signs it will start to do it more as it'll have more first-hand corroboration
     
    • Informative x 1
  5. Pink Duck

    Pink Duck Member

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    I find if TACC is set to the determined speed limit and remains on then AP will raise target speed up and down as further determined limits happen. Except I typically stop TACC ahead of a lower speed limit at the point that the car should be slowing to allow regen to meet the new limit, but then re-enabling TACC after that alone stops the limit matching. A pull and hold of stalk to set target speed when already active at the same seems to be necessary to restart the auto-speed changes thereafter.
     
    • Informative x 1
  6. VanillaAir_UK

    VanillaAir_UK Moderator UK and Ireland

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    Fleetspeed could probably cause those slow downs. Much like it does already for some corners, intersections or at final stages of an exit slip.

    Now that we have visual, you could go out and see if putting a bin liner over the sign makes any difference :D. I would be happy to buy you one of those :p
     
    • Funny x 1
  7. VanillaAir_UK

    VanillaAir_UK Moderator UK and Ireland

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    Sounds like you have an S or X. What version autopilot? Same question for @henleyregatta and @Alex987854 or anyone else that said that their car slows down and speeds up
     
  8. henleyregatta

    henleyregatta Member

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    I have an S, 2018 with AP2.5.

    If under "full" autopilot - not just TACC but AutoSteer - then if I have set speed to (say) National Speed Limit and I pass through a village/area with a speed restriction (50/40/30), then the car will first slow down to that limit - all be it after passing the sign, not before - and when the limit goes back up then speed will go back up to the limit I'd previously set.

    If I've set a lower limit - engaging AutoPilot within a 50/40/30 area at the defaults - then the speed will not go up when I pass a national speed limit sign; it never exceeds the speed first set on engagement.

    This does not apply on all roads, I've had more success on smaller roads than bigger (around here, works great on the A272, less well on the A3 at the 50 limit at Guildford). I expect this is because it's using incomplete GPS / Map data rather than sign reading (and if there's no data in the database for the road, there's no changes).

    Car also slows to take corners, particularly on slip roads and smaller roads.
     
    • Informative x 1
    • Like x 1
  9. NorfolkMustard

    NorfolkMustard Active Member

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    Changing my vote after a drive today. 60 -> 30 -> 60 all done automatically for me just now.
     
    • Informative x 1
  10. NorfolkMustard

    NorfolkMustard Active Member

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    aaand it just went 40 -> NSL on its own. NSL was at the end of temp roadworks
     
    • Informative x 1
  11. Tonybvi

    Tonybvi Member

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    Not had a chance to try in anger yet with the latest update but out of interest was this just with TACC set (and if so was it set at your driving speed or the speed limit?) or did you need to engage FSD as well before it would do this?
     
  12. roadcred

    roadcred Member

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    UK
    More concerned that it no longer picks up changes in speed limits by the Council. All these 20 mph limits round us are not recognised. What is worse is that my Volvo collects these modifications and is bang up to date and Waze also is up to date!
     
  13. pgkevet

    pgkevet Active Member

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    mid wales
    Are those red or black bordered speed signs? As I understand it the black ones are advisory and the reds are legal limits.

    pgk
     
  14. Joelly

    Joelly Member

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    Using TACC, the car remains constant
    Using auto steer the car changes to what it believes the speed limit is.
    I have experienced both slowing slightly for a bend at various times.
     
  15. Gatsojon

    Gatsojon Member

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    I’m not yet on 2020.36 so I may have voted too soon.
     
  16. Avendit

    Avendit Member

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    During lockdown I had cause to do Edinburgh - Inverness a good few times. This a mix of fast a road and dual carriageway, swapping back and fore.The roads were empty so I could experiment with autopilot.

    Mixture of versions tbh, but all behaved much the same.

    Coming onto a dual carriageway, it would pick up the speed limit change fairly accurately based off map data, then 1/4 mile later, apply it. Coming out of the dual areas, much the same, but it seemed to apply the lower limit, as someone else said, just in time for the first of the average speed cameras. Which is also about 1/4 mile later, on average.

    I think it's just lazy. If I was in traffic that would have felt like a very long 1/4 mile each time.

    It did pretty well otherwise, with supervision, but that's another thread.
     
  17. GRiLLA

    GRiLLA Member

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    So my theory is this, in a Model 3 LR.

    If I set AutoPilot in a 50 it will drop to 30 after passing a sign, message on the screen that Autosteer has reduced the speed. When the speed then does back to 50 it will speed up again.

    It won't accelerate past the speed limit when you first set it, and if anything else disrupts it during the 30 (like taking back steering but leaving TACC) it'll then stay at 30.
     
    • Like x 1
  18. Tonybvi

    Tonybvi Member

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    Exactly my experience on my Raven MX. TACC the car just carries on at same speed although it recognises the different speed limits, using FSD (effectively auto steer when navigate on autopilot is not available) the car slows down and speeds up as per the speed limits.
     
  19. Dilly

    Dilly Active Member

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    I voted yes - sometimes.
    If I put it straight into AP and leave it there, it will change up or down about 100 yards after the sign. The caveat to that is that it doesn’t always know the correct limit from gps, database or whatever.
    Conversely, TACC alone doesn’t change.
    The stupidity comes where AP was engaged and changing speed but was disengaged and then re-engaged whilst leaving TACC active. In this state, speed limit charges aren’t made by AP even though it is active.
    Cancelling both AP and TACC and re-engaging AP will allow speed limit changes.
     
    • Informative x 1
  20. Tonybvi

    Tonybvi Member

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    The latest software update uses the cameras to identify speed limits. For example in our local town we have a temporary 20mph limit to enable “spaces for people” (Covid 19 pavement extensions). The car identifies these limits via the cameras and applies them if I am on FSD. It also now stops automatically at traffic lights when on FSD.
     

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