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Autopilot does not adjust speed to speedlimit

Discussion in 'Model X' started by hannofichtner, Oct 26, 2016.

  1. hannofichtner

    hannofichtner Member

    Joined:
    Sep 23, 2016
    Messages:
    10
    Location:
    San Francisco
    Hi,

    when I engage the autopilot in a 65 mph speed limit zone the speed is automatically set at 70 mph (my pre-defined +5 mph deviation).

    BUT when I then enter a 45 mph zone the speed stays at 70 mph and does not go down to 50 mph.

    Is that how it is supposed to be?

    Thanks!
     
  2. PGeer

    PGeer Member

    Joined:
    Nov 10, 2014
    Messages:
    159
    Location:
    Port Townsend, Wa
    Yes - as designed. You have to manually depress the lever to slow down when speed limit drops. Although, if you're following cars that are adjusting, you'll of course maintain their speed.
     
  3. larmor

    larmor Active Member

    Joined:
    Oct 27, 2014
    Messages:
    1,370
    Location:
    Irvine, CA
    Curious, i was using AP on a divided road with speed limit of 50 and passed by school and car slowed down to 25. Although it was after hours, this auto reminder was great for safety purposes!
     
  4. travwill

    travwill Active Member

    Joined:
    May 1, 2015
    Messages:
    1,189
    Location:
    Chicago, IL
    This is odd. I went on a 2K roadtrip and were on a lot of 70mph roads, to 55, and went through towns that dropped to 45, 35 in town, then back up to 45, 55, 65, etc. It was one of the most useful periods of autopilot for me.

    It always auto adjusted for me. I always thought it was kinda cool as it did it right when the street sign passed by that it most have read always. I want to say it stayed 5mph above the sign limit as well.
     
  5. outie

    outie Active Member

    Joined:
    May 22, 2016
    Messages:
    1,267
    Location:
    SoCal
    Did autopilot brake hard to adjust to the new speed? I really hate it when it does hard brakes where one (human) would normally just lift off the "gas" to slow down gradually.
     
  6. jonman

    jonman Member

    Joined:
    May 22, 2016
    Messages:
    112
    Location:
    MD
    AP won't slow you down as you enter different speed zones. Just like it won't speed up if you enter a higher zone. One big caveat to this is if you are not on the interstate as smaller roads will force AP to change it's max speed while using autosteer.

    This happens to me EVERY time during my daily commute. I start out on a small 2 lane road and the speeds go from 45, 35, 25 and each zone AP automatically adjusts and tells me that autosteer is limited to 5MPH over the posted limit. I have mine set to 10MPH over posted. However, when the speeds jump back to 35, 45, AP does not increase and this is by design.
     
    • Informative x 1
  7. davidc18

    davidc18 Active Member

    Joined:
    Apr 25, 2015
    Messages:
    1,196
    Location:
    Ft. Lauderdale
    speed assist 1.jpg speed assist 2.jpg speed assist 3.jpg It always sets +5 over what it thinks the restricted road speed limit is. You have no control over it. Speed Assist has no effect on what speed AP sets.
     
  8. kort677

    kort677 Active Member

    Joined:
    Sep 17, 2015
    Messages:
    4,601
    Location:
    florida.
    yes, only on some undivided roads will the AP restrict your speed based on the posted limit
     

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