LDA newby question

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Wando, Dec 6, 2020.

  1. Wando

    Wando Junior Member

    Joined:
    Mar 8, 2007
    19
    3
    0
    Location:
    United Kingdom
    Vehicle:
    2017 Prius
    Model:
    Business Ed. Plus
    I have recently acquired a 2017 Gen 4 and on a short trip on the motorway I thought I would test the LDA function.
    I found that the steering assist works fine when the car drifts towards the center of the motorway (i.e. to the right here in England, as we drive on the left), however if I let the car drift towards the emergency lane (i.e. to the left) I get the alert but no noticeable steering assist.
    The only difference is that the line to the left is solid rumble white as opposed to the broken line to the right.

    Is this a feature or was the system somewhat malfunctioning?
     
  2. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    10,236
    12,561
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    Mine is wimpy is both directions. So is my wife's '17 Prius Trim 2. I tried testing it and never felt any assist although it will beep when I cross the line. Since the only times I cross the line is when I want to, I keep it turned off.

    But that's here in North America. European versions often have different features.
     
    kithmo, Wando and alanclarkeau like this.
  3. alanclarkeau

    alanclarkeau Senior Member

    Joined:
    Feb 24, 2016
    6,857
    7,409
    0
    Location:
    near Brisbane, Australia
    Vehicle:
    2016 Prius
    Model:
    N/A
    It isn't self-steering. It is Lane Departure Alert. Read the Manual - it'll tell you what it's about - and it's not designed or purported to do what you're trying to get it to do.

    It's to wake you up if you drift out of the lane by beeping - and then partly steer back. Sometimes the steering back is better than not - but it won't re-centre in the lane. It expects that you've woken up by then.
     
  4. RRxing

    RRxing Senior Member

    Joined:
    Jul 7, 2009
    2,333
    1,602
    0
    Location:
    NEPA
    Vehicle:
    2017 Prius
    Model:
    Three Touring
    Yeah, the force of the wheel guiding you back into the lane is negligible.
     
    Tande, Wando, krmcg and 1 other person like this.
  5. alanclarkeau

    alanclarkeau Senior Member

    Joined:
    Feb 24, 2016
    6,857
    7,409
    0
    Location:
    near Brisbane, Australia
    Vehicle:
    2016 Prius
    Model:
    N/A
    AND - if you use it too much - on a windy country road - it'll suggest you stop for a rest. With this indicator showing up in your HUD:

    upload_2020-12-7_22-57-54.png , and a suggestion that you need a rest on the main display. Fortunately, you can press "BACK" and it goes away.
     
    kithmo, krmcg and jerrymildred like this.
  6. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    10,236
    12,561
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    Mine did that one time ... in 50 mph cross winds on the interstate. Oh, and a couple other times after driving 3+ hours non stop during our trip to Ohio in October.
     
    alanclarkeau and krmcg like this.
  7. RRxing

    RRxing Senior Member

    Joined:
    Jul 7, 2009
    2,333
    1,602
    0
    Location:
    NEPA
    Vehicle:
    2017 Prius
    Model:
    Three Touring
    This is true, which is why I leave LDA off. :rolleyes:
     
    kithmo and jerrymildred like this.
  8. Wando

    Wando Junior Member

    Joined:
    Mar 8, 2007
    19
    3
    0
    Location:
    United Kingdom
    Vehicle:
    2017 Prius
    Model:
    Business Ed. Plus
    Yes, I was testing the system again today and it did just that.
    I figured it was time to stop :LOL:

    Do you know if there is a way to adjust the volume of the audio alert?
     
  9. alanclarkeau

    alanclarkeau Senior Member

    Joined:
    Feb 24, 2016
    6,857
    7,409
    0
    Location:
    near Brisbane, Australia
    Vehicle:
    2016 Prius
    Model:
    N/A
    I don't think you can adjust the volume.

    I never turn mine off - I'd rather a "Once in a Lifetime" (as opposed to Once in a Deathtime) when it ACTUALLY woke me up - so put up with the occasional beep.
     
    Wando likes this.
  10. Fester

    Fester Active Member

    Joined:
    Mar 29, 2010
    201
    195
    0
    Location:
    Ohio
    Vehicle:
    2017 Prius
    Model:
    Two
    I do leave the alert on as a reminder, but the assist as stated is very weak. I don't do much highway driving, but even on a well marked highway, its enough to steer back towards the curb side from crossing the center line, but when it reaches the curb side if it hits any "rumble strips", the assist isn't enough and you'll be off the road.
     
    Wando, alanclarkeau and krmcg like this.
  11. Wando

    Wando Junior Member

    Joined:
    Mar 8, 2007
    19
    3
    0
    Location:
    United Kingdom
    Vehicle:
    2017 Prius
    Model:
    Business Ed. Plus
    Exactly what I have been observing.
    I have concluded that the road camber is playing a role in this behaviour. Enough power to steer away from the camber, but not enough to steer into it.
     
  12. dbstoo

    dbstoo Active Member

    Joined:
    Oct 7, 2012
    694
    361
    0
    Location:
    Near Silicon Valley
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    I wanted "lane keeping", so I was a bit disappointed when I found that it was (mainly) a warning. On the first long (500 mile trip) I discovered that during 17 years of driving a Gen1 Prius I'd developed a bad habit of letting the car wander in the lane. My logic was that the lane was wide enough for two Prius side by side, so a bit of drifting was OK. On that trip I drifted so much that I got the coffee cup warning within the first 150 miles. I've left the warning on to help re-train myself to keep the car centered. It's working.

    Dan
     
    krmcg likes this.
  13. kithmo

    kithmo Couch Potato

    Joined:
    Apr 25, 2010
    2,404
    2,761
    47
    Location:
    South Yorkshire, UK
    Vehicle:
    2016 Prius
    Just a half hearted, useless gimmick IMO. I found it slow to respond, that is, I was over the line before it warned me, so I turned it off.
    In 47 years of attentive driving I've never unintentionally strayed across lanes and I don't intend to start doing so now.
    If I do I'll probably be passed out or dead so a warning and slight nudge of the steering will not help anyway. :)
     
    jerrymildred and alanclarkeau like this.
  14. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    10,236
    12,561
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    Ditto. I see people wandering over the line all the time here and I can't figure out why they do that. What could possibly demand more of your attention than not killing someone with your vehicle?
     
    #14 jerrymildred, Dec 10, 2020
    Last edited: Dec 10, 2020
    dbat23, alanclarkeau and kithmo like this.
  15. alanclarkeau

    alanclarkeau Senior Member

    Joined:
    Feb 24, 2016
    6,857
    7,409
    0
    Location:
    near Brisbane, Australia
    Vehicle:
    2016 Prius
    Model:
    N/A
    I figure it's like Seatbelts and AirBags. They're there for the 1:1,000,000 time that I'll need them, so I put my belt on. Similarly, LKA, if it saves me just once - it's done its job.
     
    dbat23, krmcg and jerrymildred like this.
  16. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    10,236
    12,561
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    I do use it on long trips where I might be tempted to drive longer than what my alertness quotient can support.
     
    krmcg and alanclarkeau like this.
  17. alanclarkeau

    alanclarkeau Senior Member

    Joined:
    Feb 24, 2016
    6,857
    7,409
    0
    Location:
    near Brisbane, Australia
    Vehicle:
    2016 Prius
    Model:
    N/A
    Most of my driving is on Motorway - fairly straight. It reminds me if I change lanes without using an indicator/blinker/directional signal/trafficator/turn indicator/turn signal/winker, or try to exit without using same. So, even if there's nobody around, I now indicate - it's taught me not to be lazy. [Lazy is a subjective term.]
     
    #17 alanclarkeau, Dec 10, 2020
    Last edited: Dec 11, 2020
    jerrymildred and krmcg like this.
Loading...