Car taken action on speed signs which are not there

[T3chno]

Hi I have a strange and dangerous thing happen twice to me. I have a 24 plate Formentor 1.5 dsg V2 450mile on the clock, loaded with brill tech. I was driving on road in the northeast of England A19 the car was set to run fully automatic reading speed signs with acc etc on. Travelling at 70mph no problem until suddenly and without any speed sign warning the car breaks and sets the speed 40mph. Subsequent presses of the resume does nothing, I manually accelerate quickly as I had a lots of vehicles travelling behind me and because of the erratic braking could have caused a serious accident had I not been quick on the accelerator. This stayed at 40mph and displaying the same..for at least 1.5-2miles then again without any speed signs been present the car displayed 70mph which then accelerated back up to 70mph. As I have said this has happened twice on the same road but total different location. I had someone else in the car who confirmed that they was no 40mph road signs. The only thing I can think of is it tide up to the mapping software that has seen prev road works and is not up dated even though I have everything up to date. Very alarming when it happens. Anyone else had any issues like this.

 

[llinasenc]

Hi, here in Spain many people have also reported the same issue while driving in highways, with the danger with could cause.

No solution has been provided as it has been reflected in the car diagnosis, so, be careful.

Enviado desde mi Redmi Note 9 Pro mediante Tapatalk

 

[Wyld Stallyn]

Sounds scary

This is why I engage the speed regulator device under my right foot and don't trouble the over-complicated autodrive systems, just because it's there doesn't mean you gotta use it.
And If your experience of it not doing what you expect it to teaches us anything it's...

Man One - Skynet Nil

I trust me, over software Every Time.

 

[Manse Runner]

I very occasionally see the wrong speed displayed on the dash, for places that used to have a temporary speed limit during extended road works.
I've been a bit confused by this, as I thought it was only displaying the road signs from what the camera could see, and not by referncing the cars GPS position against a known national (European ?) database of speed limits. Can anyone confirm is it what the camera sees, or GPS position based ?
I would never trust that type of technology to automatically brake and accelerate the car, so it's not been an actual issue for me.

 

[T3chno]

Hi, here in Spain many people have also reported the same issue while driving in highways, with the danger with could cause.

No solution has been provided as it has been reflected in the car diagnosis, so, be careful.

Enviado desde mi Redmi Note 9 Pro mediante Tapatalk

Thank you I will be more aware.

 

[SRGTD]

@T3chno - sounds like the old problem of the car mistaking mph for kph; 70 kph is the equivalent to 43 mph (so roughly 40mph). Even though there wasn’t a 40 mph sign on the road you were travelling on, if there was a 40 mph speed limit sign on an exit slip road that you were passing, then maybe your car was able to ‘see’ it and reacted accordingly.

I can remember reading on VW Golf forums on the early days of the mk8 Golf of quite a few owners having this - or a similar - issue (i.e. mistaking mph for kph). I believe there was a software update to fix the issue although that fix was at least a couple of years ago, so the more recent version of software in your car should reflect the fix.

 

[Villabrand]

I have seen mine pick up the road signs on side streets before, thankfully I always have it off. Someone on here previously mentioned their car picking up the sign on a drive way that said 5mph. So for safety I recommend not using the auto speed adjust feature.

 

[T3chno]

@T3chno - sounds like the old problem of the car mistaking mph for kph; 70 kph is the equivalent to 43 mph (so roughly 40mph). Even though there wasn’t a 40 mph sign on the road you were travelling on, if there was a 40 mph speed limit sign on an exit slip road that you were passing, then maybe your car was able to ‘see’ it and reacted accordingly.

I can remember reading on VW Golf forums on the early days of the mk8 Golf of quite a few owners having this - or a similar - issue (i.e. mistaking mph for kph). I believe there was a software update to fix the issue although that fix was at least a couple of years ago, so the more recent version of software in your car should reflect the fix.

Hi thanks for your response. it has the latest software as I have just purchased it new. I am not sure if this is the same as you are describing. Everything is set to MPH display shows 70 MPH (because that is the speed of the road) then as I said it suddenly shows 40MPH on the display obvious the car reacts, there are definitely NO other road signs about and the road is 70MPH. Then again after about 1.5-2 miles the cars display suddenly shows 70 MPH and the car speeds back up. Very strange and dangerous. It has been working fine on other roads.

 

[dashnine]

Have had this happen a few times, usually by picking up speed limit signs for adjacent roads, or signs the wrong way round. But it has happened when it's got an incorrect speed limit from the SatNav mapping. You can look on HERE maps and see what the limit is set at for the road.

Only solution really is to hit the accelerator or quickly press the + button on the steering wheel a few times to overide the detected cruise speed.

I wouldn't assume your car has the latest software (not that that would fix the issue) because it's a new car, the factory installed version tends to run a little behind the latest release (which is 1969, but I'm not sure?).

 

[T3chno]

Have had this happen a few times, usually by picking up speed limit signs for adjacent roads, or signs the wrong way round. But it has happened when it's got an incorrect speed limit from the SatNav mapping. You can look on HERE maps and see what the limit is set at for the road.

Only solution really is to hit the accelerator or quickly press the + button on the steering wheel a few times to overide the detected cruise speed.

I wouldn't assume your car has the latest software (not that that would fix the issue) because it's a new car, the factory installed version tends to run a little behind the latest release (which is 1969, but I'm not sure?).

Hi definitely not picking up 40mph speed sign non around, so I suspect it’s mapping software that has had a previous limit set probably due to road works etc. I have manually updated the firmware to the latest version. Thanks for your input

 

[Karbonfaiba]

I previously posted here about this issue.

But in short, the (previous generation) ACC was better when it was just traffic sign recognition without mapping data.

It works okay on longer trips, but if you are encountering the same speed limit errors on your daily commute, it's less stressful just to turn "respond to speed limits" off, if like me, you frequently use travel assist purely as a lane hold autopilot - while you micromanage the touchscreen climate controls in better safety.

Legally you need to be doing the speed limit at the sign, so the car responding by the time it drives past a limit is too late, the mapping data means it can reduce speeds before limits to a driving test standard. But this standard is very unnatural behavior for most drivers in the UK.

Saying that, the mapping data is useful for auto braking in hybrids on approach to roundabouts. On regular engines, this feature takes the same place of the eco tips - a feature that also gets disabled for it's intrusive presentation.

 

[Tell]

Well no they all used the digitised map speed modified for the dynamic speed read off the camera. This was a long issue with AAC before mib3 and any new fangled technology as an adjoint. The undertaking one is another which is a candidate for breaking. Here you can code that one out. Feels like the digitised map speed has an issue as touched on above. Where new maps and reporting back to Here Maps may fix the issue. Side road map reading for back of lorry signs can do it. The Calais / Belgium strip my TSR would happily read the max speed off the back of lorries.

 

[Villabrand]

Best option, switch it off and drive the car like you did the old days before any of these so called safety features.

At least we have not got the new speed limiters being introduced end of this month. Although it would not surprise me if an update comes out to code that in!

 

[SRGTD]

Best option, switch it off and drive the car like you did the old days before any of these so called safety features.

Agree. There were none of these so called safety features when I started driving back in the 1970’s. My current car has many driver aids that I don’t use; because I like to feel I’m controlling the car, not the car controlling me!

At least we have not got the new speed limiters being introduced end of this month. Although it would not surprise me if an update comes out to code that in!

I seem to remember reading that speed limiters were being made mandatory in the UK on new cars introduced from July 2024. I think that ‘new cars’ meant all-new (and facelift?) models introduced after the implementation date, so existing cars already on the roads shouldn’t be affected.

 

[dashnine]

I seem to remember reading that speed limiters were being made mandatory in the UK on new cars introduced from July 2024. I think that ‘new cars’ meant all-new (and facelift?) models introduced after the implementation date, so existing cars already on the roads shouldn’t be affected.

I think it's 'all' new cars need to have it, rather than new models (which was from 2022?). So I suspect you won't be able to buy a unregistered pre-facelift Formentor after 1st July, they'll all be registered before then and then the new facelift Formentor will come with the speed limiter.

 

[Seastormer]

Best option, switch it off and drive the car like you did the old days before any of these so called safety features.

At least we have not got the new speed limiters being introduced end of this month. Although it would not surprise me if an update comes out to code that in!

Another reason to be keeping my current car longer.

 

[Karbonfaiba]

I already decided my next car is going to be a few years older lol. I would still say newer is typically better, especially with tech performance, but the role of tech in cars overall has been a trend of: more intrusive, less beneficial. It's evident that as we go further, more buttons are appearing that turn the tech off.

It's not just the ACC, nor the maps, it's not VAG, it's all car manufactures sharing the same annoyances conscripted by top-down compliance. I also know nothing is going to be done about it and probably like seatbelt chimes were annoying in the past; it'll likely be normalized into society with each generation having a certain peak and decline. Innovation happens, there is a golden age, then regulation spoils it.

 

[Villabrand]

I already decided my next car is going to be a few years older lol. I would still say newer is typically better, especially with tech performance, but the role of tech in cars overall has been a trend of: more intrusive, less beneficial. It's evident that as we go further, more buttons are appearing that turn the tech off.

It's not just the ACC, nor the maps, it's not VAG, it's all car manufactures sharing the same annoyances conscripted by top-down compliance. I also know nothing is going to be done about it and probably like seatbelt chimes were annoying in the past; it'll likely be normalized into society with each generation having a certain peak and decline. Innovation happens, there is a golden age, then regulation spoils it.

It's as if the bureaucrats are trying to put us off driving

 

[vmaxkiddy]

Hi I have a strange and dangerous thing happen twice to me. I have a 24 plate Formentor 1.5 dsg V2 450mile on the clock, loaded with brill tech. I was driving on road in the northeast of England A19 the car was set to run fully automatic reading speed signs with acc etc on. Travelling at 70mph no problem until suddenly and without any speed sign warning the car breaks and sets the speed 40mph. Subsequent presses of the resume does nothing, I manually accelerate quickly as I had a lots of vehicles travelling behind me and because of the erratic braking could have caused a serious accident had I not been quick on the accelerator. This stayed at 40mph and displaying the same..for at least 1.5-2miles then again without any speed signs been present the car displayed 70mph which then accelerated back up to 70mph. As I have said this has happened twice on the same road but total different location. I had someone else in the car who confirmed that they was no 40mph road signs. The only thing I can think of is it tide up to the mapping software that has seen prev road works and is not up dated even though I have everything up to date. Very alarming when it happens. Anyone else had any issues like this.

Best short term measure is to take it out of speed sign recognition, it suddenly decides mph should be kmh. Then book it in with dealer. I had the same issue and the cure was for the info screen and hardware to be changed.

ACC issue

Has the strangest problem today with ACC it was bouncing between 70 and 40 as I was driving along Even with ACC off you could see the speed limiter moving up and down Anyone else seen this Sent from my Pixel 6 Pro using Tapatalk

www.seatcupra.net

 

[dashnine]

Best short term measure is to take it out of speed sign recognition, it suddenly decides mph should be kmh. Then book it in with dealer. I had the same issue and the cure was for the info screen and hardware to be changed.

ACC issue

Has the strangest problem today with ACC it was bouncing between 70 and 40 as I was driving along Even with ACC off you could see the speed limiter moving up and down Anyone else seen this Sent from my Pixel 6 Pro using Tapatalk

www.seatcupra.net

My ACC always argues with the sign recognition for the first trip after a infotainment reboot.

TSR sees a 50 sign, communicates 50, ACC reads it as Kmh and promptly sets itself to 31mph while TSR still showing 50. Next trip it's back to normal.