Lane Departure Assist

It’s legal requirement to have it on when the car starts as set to manufacturers. You can add it to the drop down controls so it’s one button away.

There is no such law in the UK. It’s not mandatory to have LDA and it’s not mandatory to have it default to on in cars that do have LDA. Will try the shortcut method if that’s the only option.

I believe it’s mandatory in a lot of regions they sell the car to, mostly being EU, China. I assume they cannot be bothered to invest the effort as they would have to break GSR2 compliance in the EU just specifically in the UK. If I were working there I wouldn’t bother making extra software options just to satisfy a small handful of customers.

It’s not mandatory in the EU either. You are confusing LDW (a warning) with LDA (steering). I don’t mind the warning since it can be set to vibrate or sound and it remembers the setting. LDA is the problem. It’s bizarre that it constantly goes off on narrow single lane roads where it’s impossible to stay in lane. If i was designing it, it would only work where there is an actual lane, ie white lines on both sides of the car such as dual carriageway or motorway.

[https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX%3A32021R0646&utm](https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX%3A32021R0646&utm) I don't know why you keep thinking it doesn't apply, to meet certain safety standards, and Euro NCAP ELKS and LKA should be included in their systems to meet certain levels of safety certifications, mandatory is not always true there are certain exceptions but as outlined to get good NCAP scores etc it's included. As a manufacturer it makes perfect sense to just enable and enforce it across all vehicles to save development cost. I know for a fact it has to be enabled on new vehicles in China by default, so again it is both to meet certain safety certifications and probably a cost saving in the developmental process. [https://www.interregs.com/articles/spotlight/229/eu-regulation-on-emergency-lane-keeping-systems-published?utm\_source=chatgpt.com](https://www.interregs.com/articles/spotlight/229/eu-regulation-on-emergency-lane-keeping-systems-published?utm_source=chatgpt.com)

LDA gets the company a higher NCAP rating, therefore it has been set to auto come on every time the car starts. We have the same problem in Australia and it's been a hot button debate because we don't actually have the law the EU has yet but it's due in 2 years, so companies like BYD and Volvo for sure have simply made their highest safety spec software the default for our market, and by the sounds of it, the UKs too. "Yet with lane support systems – such as lane-departure warning, emergency lane-keep assist and lane-trace assist – now necessary for a five-star safety rating, Euro NCAP and ANCAP are updating their protocols to include real-world testing." (https://www.whichcar.com.au/news/euro-ncap-upset-carmakers-did-bare-minimum-lane-keep-assist#:~:text=%E2%80%9CWe%20are%20kind%20of%20upset,said%20a%20despondent%20van%20Ratingen.) Unfortunately it's one of those things you'll need to short key and turn off. I do empathise with you though, I know driving on euro/UK country roads is an absolute pain with these sorts of systems and makes the drive so much more dangerous. They don't read the gutters of the road either incase you were wondering, they only detect lines.

Again, that document proves its NOT mandatory. It is only required to work on solid lane markings (point 3.6.2(c)). On dashed lines, which you frequently cross, it should only warn you, NOT steer (Recital 6, point 3.5.2(c)). It has a strictly defined performance window (e.g., vehicle speed, lateral departure velocity, road conditions - points 3.5.1, 3.6.1).

I didn’t say it was mandatory, I say they do it to get certain safety ratings, I even explicitly state it’s not mandatory, but to the manufacturer why would they make it easy to turn off? It would defeat the point of their safety features. I think you have an inability to read or understand what you are reading mate. The manufacturer isn’t just going to add exceptions for every Tom Dick and Harry who don’t like their safety features and that’s just how it works. It’s the same in many other vehicle brands and not specifically BYD.

In your first reply you said it was a legal requirement. In your second reply you said it was mandatory. Hence my rebuttal of your false posts that may mislead other readers.

Yes it will be interesting to see how it pans out in rural areas of UK, Australia and similar. I can’t see a law anywhere that mandates LDA on rural, single lane roads. The laws specifically state solid white lines and flat roads like motorways. It’s definitely going to steer people into potholes in the UK!

You definitely are not able to read, in the first one I stated I thought it was mandatory, in my second comment I state explicitly it’s not and not a legal requirement. I’m gonna stop here because you are clearly just arguing for the sake of it. I think it’s pretty clearly stated why they do it even if it’s not a mandatory requirement, if you are too stupid to understand that it’s not my problem.

To be fair it only triggers when crossing a line if you don’t indicate, which you should before ever crossing a line.

use turn signals when you cross the line. they disable this feature temporarily. or cross it at less than 60km/h.

I live in a rural area in the UK and most ADAS systems are shockingly bad. A lot of roads near me are unmarked yet the car makes corrections to lines that don’t exist. Thin road, tractor coming towards me in the opposite direction, I move to very left edge of the road and the car tries to pull me into the tractor. Overtaking a bicycle, car tries to pull me into the biker. It’s dangerous and such a PITA to turn it all off every drive

An alarm that is always on is _not_ an alarm!

Can you check you are able to disable 'prevention' under LDA. I have it set to 'warning' only on my elderly father's car.

It scores points on ENCAP and ANCAP testing, and to get those points it has to turn itself back on. Its a load of bullshit on chips, and ANCAP is at least starting to push back on it, saying you don't get the points if the features are annoying or don't work well. If you want to pull a fuse you can, but its for the entire ADAS system, you will lose all assist features including cruise control.

Thanks. I’ll experiment a bit more before pulling the fuse. Only had the car a few days. I only drive on country lanes so have no need for any adas features. There are very few road users here, mainly tractors.

Thanks, I did try that but it resets. The warning part ie vibrate or sound does retain but if I set it to prevention rather than warning, it resets when I restart the car. As others have said, its expected behaviour so I’ll have to live with it or remove the fuse.

I live on narrow country lanes. Each lane is less than a cars width because of the ditches. You have to straddle the white line until a tractor comes the other way. Its not realistic to drive with indicator permanently on, in 40 years of driving I’ve never seen anyone drive like that. It would be similar in towns with parked cars along the sides, you have to straddle the white line and the car should not grab the steering. LDA is useful on motorways but its not needed on narrow roads full of potholes.

Yes thats my experience too. The laws are very specific about it being needed on motorways and flat, high speed roads with multiple lanes. Its crazy to enforce it on narrow roads full of ditches and potholes, that the car isn’t aware of but the driver is! Unfortunately, it seems that very few people have experience of rural uk, australia etc.

it's a UK thing that they bother to paint a line on a road not wide enough to take 2 lanes. Most of rural Australia doesn't bother at all, they barely bother with kerbs...driver just needs to drive to the conditions. They probably could do with a kangaroo movement detector with the amount of roadkill that jumps out in front of vehicles.

Might be a European regulation or something I don't live there.