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Over ride speed sign detection?

Avendit

Member
Apr 18, 2019
850
564
EDI
Hi all,

I wondered if a way to override the speed sign detection has been found yet? We drove up the A9 last week, where AutoPilot was previously pretty decent, but since the speed sign recognition it's turned into a complete pain.
It picks up these
1626258341385.png

at the end of each duel carriageway section (this one from here Google Maps), after which I can have auto steer at 50, press the accelerator to make auto steer work at 60, or put on TACC and do the steering myself. 1st world problems I know, but a step back from (now much) older versions without recognition which I could AP down most of the road other than choosing a lane at the start of each duel carriageway.

Is there anything I can do about it, other than wave a national speed limit sign on a stick in front of the cameras after each one?
 
  • Funny
Reactions: Durzel

Durzel

Active Member
Jul 17, 2019
3,539
2,534
Bath, UK
Nothing to add other than your last line made me chuckle. A NSL sign on a stick held out of the window, genius! Might be a bit illegal though.
 

Envchem

Member
Nov 13, 2019
194
169
Liverpool, UK
I don't think there is much you can do about this. I have the same issue on a stretch of A49 where the limit is 60 but sometimes the car drops it to 30...With no obvious reason and not every time. Then I have to wait for the next roundabout where upon resuming AP it fixes itself.
 

VanillaAir_UK

Well-Known Member
Jun 17, 2019
8,415
5,945
Surrey, UK
Not ideal but if you have TACC set speed to current limit then could you not raise the TACC speed limit offset [added for clarification] in vehicle settings to +20 if it will go that far? Its probably much less restricting now that speed offset and warnings are now separate settings.
 
Last edited:

DigbyChicken

Member
Apr 7, 2021
159
122
Yeovil, Somerset
Not sure of the solution, but in the last few days I've had the car pick up an angled 30mph sign for the b-road that feeds onto the road I was on and think that that limit therefore applies. And it's misread an 'End of controlled parking zone' sign as a national speed limit sign (and therefore suggested I could approach an urban roadabout at up to 60mph). Luckily, I didn't have even the cruise control switched on in either case; I just noticed it on the screen.
 
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Plagued

Member
Apr 9, 2019
241
191
Uk
yea I get it a lot with any smaller tuning off a 60/70mph A road with a bit of a slip road off the main road, where you can see the 30 sign.
As the signs are angled slightly it can read them and suddenly drops from 70 to 30. I have it almost every day on a 70mph dual carriageway, so I use my own foot for that bit of road
 
  • Informative
Reactions: DenkiJidousha

GeorgeSymonds

Active Member
Mar 16, 2018
1,369
997
UK
I think its one you have to put into the "local training for each country is required". If it's any consolation, if you go back far enough (and it was 10 years or so ago) a BMW I had that could read speed limits would change to what ever it saw on the back of a lorry as the max speed. It will get addressed at some point but its on a pretty long to do list.
 

Durzel

Active Member
Jul 17, 2019
3,539
2,534
Bath, UK
I think realistically there will come a time when the Govt has to think about speed signs with automated technologies in mind - e.g. banning their use on the back of lorries, wheelie bins, etc.. and only having the red border for actual universal limits, perhaps a blue border for advisory or vehicle-specific ones, etc?
 

Dilly

Active Member
Feb 24, 2020
2,223
1,811
Norfolk
I’m pretty sure TACC can be overridden by upping speed with the scroll wheel. AP is limited to what it sees. No way round that.
I picked up a 10mph sign in a car park opposite the turning I was exiting. Proper limit 30mph!
 
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Reactions: Durzel and Nick77

Avendit

Member
Apr 18, 2019
850
564
EDI
AP is only a hard limit on A roads; on duel carriage ways and motorways you can be illegal up to the AP limit of whatever it is.

The 20% increase should work (10% did), but that leaves you defaulting to 84 in a 70, which is a bit much for a default.
 

Nick77

Deep Blue Model 3 LR (2021 MIC)
Mar 15, 2020
434
157
Burton-on-Trent
I’m pretty sure TACC can be overridden by upping speed with the scroll wheel.
Exactly what I was about to say. Scroll wheel override. Just flick it up a few times.

I've had a few occasions whereby a 30mph speed zone shows on the screen as 10mph for no particular reason.
 

Avendit

Member
Apr 18, 2019
850
564
EDI
Exactly what I was about to say. Scroll wheel override. Just flick it up a few times.

I've had a few occasions whereby a 30mph speed zone shows on the screen as 10mph for no particular reason.
TACC can, but not AP on a single carriageway :-(. Have to press the accelerator and put up with lots of 'AP won't brake' messages.
 

Nick77

Deep Blue Model 3 LR (2021 MIC)
Mar 15, 2020
434
157
Burton-on-Trent
Always works for me.

Does it depend on what setting you have for the max allowed adjustment above what the limit is set at? I turned that off completely.
 

Avendit

Member
Apr 18, 2019
850
564
EDI
Always works for me.

Does it depend on what setting you have for the max allowed adjustment above what the limit is set at? I turned that off completely.
I'll take a look at that.

@GRiLLA - mixed duel and single. I have pondered an FOI request to find how much this experiment brings the base to 50, but I definitely don't want to be the one at the front of a queue due to AP!
 

GeorgeSymonds

Active Member
Mar 16, 2018
1,369
997
UK
I think realistically there will come a time when the Govt has to think about speed signs with automated technologies in mind - e.g. banning their use on the back of lorries, wheelie bins, etc.. and only having the red border for actual universal limits, perhaps a blue border for advisory or vehicle-specific ones, etc?
I think the opposite. If the car can't cognitively recognise a true speed limit sign and one thats not because its on a side street, back of a lorry, or some do-good villagers make a cardboard one for unofficial traffic calming, then I'm not convinced the car will ever be bright enough to drive itself. As an aside, BMW (which is mobileye) cracked the problem somehow.
 

pgkevet

Active Member
Jul 1, 2019
1,470
1,305
mid wales
After a lot of serious thought on this matter, I conclude that waving a stick out of the window is daft. It's so much easier to stick the NSL sign to the wiper blades with a suction cup magnet on the inside of the windscreen so the sign flips up as it passes the cameras:cool:
 

Guags99

Member
Nov 5, 2020
15
26
Chicagoland
I know it has been a couple weeks, but I just came across this thread. I am constantly being annoyed by my MY slowing down when it passes speed limit signs for other types of vehicles. There is a stretch of road I travel often that has speed limit signs very frequently. But after each one that sets the speed to 45MPH, there is one right after it that says 35MPH for trucks and buses. I like to use autosteer often, so you cannot override it as you can just on cruise. So my car will suddenly drop in speed to 40MPH from 50MPH for no reason. On non-major highways it is limited to 5 over the limit. I know it annoys me, but the people behind me see even more upset!! Kind of dangerous.

I can't believe that this has been a known issue for some time and it is not fixed. If Autopilot can distinguish a bicycle from a motorcycle, why can't it just read all the text on a sign to know what to do. I'm pretty sure my car knows it is not a truck or a bus!

I guess I'll have to just find a long stick and a sign as the OP suggested!
 

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