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End XX Speed Limit Signs

Discussion in 'Model S' started by jfoxny, Aug 23, 2016.

  1. jfoxny

    jfoxny Member

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    Here in New York (perhaps everywhere?) you'll sometimes come across speed limit signs that do not tell you what the speed is but rather what the speed limit is no longer (as I do every day on my commute). For example, you're on a 45mph road and it changes to 55mph but the sign says "end 45mph" rather than 55mph. The car doesn't seem to understand this and "reads" the sign as 45mph. This is especially annoying while on Autopilot as the car will only do 5mph over the limit if the limit is less than 55mph (or at least that's how it seems). Anyone have a similar experience? Is there a workaround?
     
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  2. RogerHScott

    RogerHScott Active Member

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    The speed limit sign reader is known to be far from perfect. It routinely reads highway/route number signs as speed limits if they're
    plausible speed limits (e.g., multiples of 5). It is also not at all clear what other stuff can and can't appear on the same sign and still
    have it be recognized as a speed limit.
     
  3. alseTrick

    alseTrick Member

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    Those NY signs sound really stupid.
     
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  4. WannabeOwner

    WannabeOwner Member

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    Curious to learn how the driver knows it is 55 MPH (rather than 60 MPH or whatever the "unrestricted" speed limit is)
     
  5. mrElbe

    mrElbe Member

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    I encountered these silly signs also in PA last weekend. So the sign says "End of 35 limit". When I entered the 35 zone it was a 45 limit before. So after this silly End sign, do I go now 45 again or can I go 55, the state limit?
     
  6. JeffK

    JeffK Active Member

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    You might consider collecting all the information you can and submit it to Tesla.
     
  7. ccharleb

    ccharleb Member

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    Montreal (QC), Canada
    In Quebec province (Canada), on highways, we have 2 signs for speed limit... MAX 100 km/h and MIN 60 km/h.... guess how many times the Tesla select the 60 sign.... :rolleyes:
     
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  8. mikeash

    mikeash Active Member

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    I encountered some of these last week and the car seemed to understand it correctly. Maybe it's a lighting or sign style difference.

    In any case, if the car misreads the speed limit and limits Autopilot speed, the workaround is to use the accelerator to manually go faster, or turn off Autosteer, steer manually, and let TACC manage your speed. Unfortunately you'll have to pick one or the other until the car correctly picks up the speed limit again.
     
  9. aesculus

    aesculus Still Trying to Figure this All Out

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    I have one of these in my neighborhood in Calif too.:)
     
  10. 1208

    1208 Active Member

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    What a perverse way to manage speed limits.
     
  11. AB4EJ

    AB4EJ Member

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    Just in case y'all ever visit historic Trenton, TN...
    TNTRE31mph_boyles_620x300.jpg

    That's for real, applies to the entire metro (if you could call it that) area...
     
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  12. RogerHScott

    RogerHScott Active Member

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    Does your Tesla recognize that as a speed limit?
     
  13. Alketi

    Alketi Member

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    I'd send Tesla a picture of the sign with a description of the issue.
     
  14. deonb

    deonb Active Member

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    I'll raise you one:
    Speed.jpg
     
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  15. mmccord

    mmccord Member

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    They are. And to answer the other poster's question, 'unposted' roads in NY are a 55mph limit.
     
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  16. aesculus

    aesculus Still Trying to Figure this All Out

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    What's that? Some crazy metric conversion? :)
     
  17. Bimbels

    Bimbels GoldMember

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    I don't get it. If you're going to take the time to erect the sign, why not just put one up that tells you exactly what the speed limit is so there is no guessing?
     
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  18. daxz

    daxz Member

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  19. Jurnimon

    Jurnimon Member

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    If the unposted speed limit is changed, you will not need to change the sign. Yes it is quite lame.
     
  20. physicsfita

    physicsfita Member

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    I Can think of a couple of reasons: Sometimes, the "end" sign is chosen to socially engineer people to drive closer to 55. The other reason has to do with implied speed limit laws. In Michigan, at least, the implied speed limit is determined by the average spacing of buildings on a road -- if the spacing is sparse, the implied limit is 55, otherwise it's 25. If a regular speed limit sign was put up, it would override the implied speed limit on a stretch that should be 25, thus depriving the sheriff of much-valued ticket revenue. :p

    Personally, I also think counties should pop to put up speed limit signs every time it changes, but that would be an awful lot of signs down some very low-traffic roads, so I can see why they want to avoid doing that.
     

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