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New car with inbuilt mapping and various cameras etc, just curious about how they determine the speed limits. Generally it gets the speed right, but there are odd occasions when it is either over or under the official limit. As soon as it "sees" a sign it usually adjust correctly.
Eg local village, 50 on approach, then drops to 30 and a few hundred metres later it drops to 20.
The car will try to brake from 50 to 20, but then stops when it gets to the 30 sign. It then brakes to 20 when the 20 sign arrives.
Is this a mistake in the base mapping or something else?
Min occasionally reads a side road speed limit if the sign is oriented slightly towards us. It does also, at a specific place on the A55 (under a bridge) decide I’m in a 20 zone that suddenly goes back to 50. So I think it’s possibly a combination of gps mistakes and cameras reading things they shouldn’t?
The Corsa e can read side road signage. Makes me think I've missed a speed board. Thankfully the ioniq doesn't read signage, makes me occasionally get the speed wrong 😭
Use your eyes and brain - if you can't do that, you've got no business being behind the wheel.
Get the bus instead.
Use your eyes and brain - if you can't do that, you've got no business being behind the wheel.
Get the bus instead.
Eg local village, 50 on approach, then drops to 30 and a few hundred metres later it drops to 20.
The car will try to brake from 50 to 20, but then stops when it gets to the 30 sign. It then brakes to 20 when the 20 sign arrives.
New car with inbuilt mapping and various cameras etc, just curious about how they determine the speed limits.
Mine uses the satnav as a base, but is overridden by the front facing camera.
Most recent remembered sign is indicated on the dash.
Presented as advice only.
2018 Insignia FWIW.
Fairly happy the thing isn't linked to the cruise control though, that sounds really badly thought through.
Realisitcally...
Use your eyes basic manners and brain - if you can't do that, you've got no business being behind the wheel. on the internet
Satnav is a start but also overridden by cameras. You can set mine to follow the speed limit in cruise control as well as anto collision etc etc
Fairly happy the thing isn't linked to the cruise control though, that sounds really badly thought through.
I don't find it to be an issue, you do get warning of its intentions and it can easily be ignored. ie use the accelerator. Generally it is quite helpful, you just have to be aware it isn't always right, particularly on long straight downhill roads with average speed cameras, eg A417 Air Ballon road works.
Mine uses the satnav as a base, but is overridden by the front facing camera.
Most recent remembered sign is indicated on the dash.
Presented as advice only.
2018 Insignia FWIW.
Fairly happy the thing isn't linked to the cruise control though, that sounds really badly thought through.
Same as mine, but I can push the speed limit it thinks it is to the cruise control with a double click of a stalk button.
The car brakes ! Blooming heck that's not great - what if it picks up a speed sign on an adjacent road, or a badly positioned one ? Mine does read signs etc but doesn't brake, just pops the current speed on the dash and heads up display.
It sounds like a mistake in the mapping.
I have mine switched off, even with the most up to date map available it's still wrong enough to be a nuisance. Also the camera keeps picking up signs on slip roads and even the back of a van a few times.
The car brakes ! Blooming heck that's not great - what if it picks up a speed sign on an adjacent road, or a badly positioned one ? Mine does read signs etc but doesn't brake, just pops the current speed on the dash and heads up display.
It isn't so much braking as easing off, if that makes sense. I am assuming the base map tells it what the speed will be so it gently eases off. it happens before any sign is visible. This is in cruise control by the way, it isn't overriding me when i am in full control, it just pings to say i am breaking the speed limit that the car assumes applies.
Check the outside of the windscreen, above the rear-view mirror. There’s often a black area that corresponds to a large black ‘box’ the mirror is attached to. In that area, there should be clear wedge-shaped cutouts with lenses in, those are the cameras that pick up external information like traffic signs.
It’s those that can make replacement screens so expensive to replace, as they have to be re-calibrated, and a lot of screen replacement operations don’t have the necessary equipment.
It takes around two hours to replace a screen, and if it’s also got heating elements built in, that’s £1000 or so for a replacement.
My current Seat reads roadsigns and pops the limit up on the dash, as did the Civic before it. There was no prior 'mapping' knowledge as far as I'm aware, could be wrong.
That said, I rarely (never) use the inbuilt satnav. Android Auto FTW.
Get the bus instead.
That's a stupid suggestion. They're even harder to drive.
This post from the other day covers some of it.
I worked on the the whole thing in my last job and still carrying on in this one.
If I have speed limiter on, mine brakes, I have basic cruise control and it doesn't brake when that is on, also doesn't brake if I'm driving myself i.e. not got speed limiter active.
As above the speed limits are built into the map and then the camera can override that. The problem is usually keeping the map up to date. On my my 10 yr old car that involves a usb stick and then 3hrs to update during which the car must be turned on. It's a real pita. Would be nicer if the car could update incrementally via your phone when you are in it
It isn't so much braking as easing off, if that makes sense.....This is in cruise control
So it just automatically lowers the speed the cruise is set to. That makes sense.
If I have speed limiter on, mine brakes, I have basic cruise control and it doesn't brake when that is on, also doesn't brake if I'm driving myself i.e. not got speed limiter active.
Does it really brake or just stop accelerating/ease off? electric or ICE car? I'm intrigued as to whether different limiter implementations vary. The limiter on our VW definitely doesn't brake - if you're going downhill for example and the car picks up speed it starts beeping to warn you once you're a few mph above the limiters set speed - it's up to the driver to actually brake.
The only way the car can know limits is some combination of GPS on a map (which needs to be kept up to date, including for temp stuff like roadworks or variable limits on motorway) and cameras/signs. The first has a variable error (especially in cities with high buildings even for a phone using mast triangulation on top), the second is susceptible to misplaced/turned/obscured signs. This seem a major problem to me if the car eases off, it's a bit different if it slams on the brakes. More of an issue for full self driving cars, which are always supposedly imminent.
The only way the car can know limits is some combination of GPS on a map (which needs to be kept up to date, including for temp stuff like roadworks or variable limits on motorway) and cameras/signs.
I never use the built-in navigation on my Ford, because it’s almost impossible to update the software; I tried downloading it from Ford’s website, but the files formatting didn’t seem to want to copy across, probably because I was doing it via an iPad, instead of a Windows machine, and my service centre wants to charge £100 for updates because it takes so long on their wifi!
I’ve used TomTom on my phone for years, initially for my job, but I’ve kept up with the subscription because I get updates on a regular basis, and it’s very good at giving me alternative options on the fly, and I get camera notifications as well.
I’ve just taken a screenshot of the current situation around Chippenham, which is pretty much spot on.
The dotted grey lines along the A350 are where there’s ongoing work duelling the stretch from Bumper’s Farm down to Showell, at which point everything slows down due to the road returning to single carriageway most of the way down to Warminster, then all the way down to Pool and Weymouth! 🤪
Ev Skoda for me and I'm assuming it brakes (brake lights go on as I slow down) - annoyingly, it goes from nsl to 20mph when the first warning at 300 yards before the 20mph happens. The braking isn't hard but it is definitely slowly quickly.
That nsl to 20 have now been changed to nsl to 40 and then the warning to 20...and the limiter still brakes, but twice - nsl to 40 (no warnings for that) and then 40 to 20 at the 300 yard warning of the 20mph limit.
As I mentioned, I've basic cruise control (not adaptive) and the car doesn't brake if I'm on cruise control or driving myself, just when the speed limiter is on (which makes sense I think, given it should limit the speed so if the speed limit changes the limiter should as well).
The car brakes ! Blooming heck that's not great - what if it picks up a speed sign on an adjacent road, or a badly positioned one ? Mine does read signs etc but doesn't brake, just pops the current speed on the dash and heads up display.
Yup, this is the next EU legislation about car safety (IIRC). Currently all new cars must have active lane assist (ie takes the wheel if it believes you've swerved out of lane) and active braking (slams on the brakes if it thinks you're about to run into something) on by default when you turn the car on. Next thing is that they will be required to automatically override you breaking the local speed limit.
Problem, as above, is that the automatic speed limit detection is utter horses*** right now - going along the motorway my car will suddenly think the speed limit is 30 at random spots. Hate to think of the accidents that'll potentially be caused.
Can back from a hols recently and hired a nicely specified petrol VW Taigo? It had the camera thing reading the speed limit signs and with Dynamic Cruise Control, accelerated and actively braked to suit, including maintaining gaps in traffic. I thought it was pretty good actually.
We did have one scary moment though, as there was a slip road and the road signage indicated that there was a 90 zone immediately after the slip road. It was a standard 90 sign, then underneath the distance and direction sign. We were on the main dual carriageway proceeding along and it must have seen this sign so sitting at 120 and it suddenly started to brake to 90.
I'm happy not to have such annoying features on my 2013 car. Well there's a verbal nag based on the sat nav map. Reading the thread highlights the challenges for automatic systems, advance warnings, signs on back of lorries, mis-aligned signs. What about the 20 zones near schools that only apply at certain times or when lights are flashing?
Car doesn't recognise or acknowledge the 'when lights flashing' bit and flags the lower speed limit.
Have to say, so far, this issue hasn't been bad for me as in, it hasn't been dangerous, just mildly annoying when it unexpectedly happens. Suspect I've been lucky with it being quiet when I've tried.