Speedometer Mismatch with Cruise Control
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or they use KMH internally and round the cruisecontrol upto the nearest KM, and the display down to the nearest KM
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My car didn't do this when it was new, somewhere at around 6 weeks into owning it this started happening. Must be some kind of small over the air update to the software.
It's infuriating, and every time I see this I question the integrity of the software and the engineering behind the car. Maybe that's petty - but it's a digital speedometer and a digital cruise control. If you can't make the car drive the selected speed, you're either ignoring my commands to the car or you're a lousy engineer. Either way, it makes me question my choice to buy the car. IMHO, of course.
Hmmmm. I wonder if the system does this in Kilometers/hour. I'll have to check, assuming I can remember. Could be a conversion and rounding issue, which would only reinforce my angst above.
It's infuriating, and every time I see this I question the integrity of the software and the engineering behind the car. Maybe that's petty - but it's a digital speedometer and a digital cruise control. If you can't make the car drive the selected speed, you're either ignoring my commands to the car or you're a lousy engineer. Either way, it makes me question my choice to buy the car. IMHO, of course.
Hmmmm. I wonder if the system does this in Kilometers/hour. I'll have to check, assuming I can remember. Could be a conversion and rounding issue, which would only reinforce my angst above.
I get this too. Recently I noticed it happened when the speed limit just increased. I was going more than 5mph faster than the old speed limit, but still under the new limit. I'm guessing programming error, alerting based on the old limit but somehow displaying the new limit also. Hopefully an easy ota fix.
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It's often driving at 1kmh lower than ACC set speed as well, so probably not a rounding mistmatch.
Still better to be safe than 1kmh above set speed.
Following my ID.4 (Pro S) 60 day check up, I was advised that this is something VW is aware of. This might be fixed with a future software release but no time frame was available from the service manager. I can live with it. Just a little annoying.
A bit late to the discussion, but we just bought our id.4 yesterday…. We took a little road trip today and I noticed the same thing. My addition to this thread is at according to waze, the cruise speed is correct, and the speedo reads 1 mph lower. Nice to know for those of us who push the limit a little.
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Am I seeing that right? The display nags you about exceeding the speed limit? Based on what?
only if you have that setting turned on will it tell you that. it is optional and based on both GPS and camera speed limit data
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Thanks. I retired from the traffic data industry and was on development teams for interactive mapping and roadside-to-vehicle data communications. The data sets not that long ago were simply not there to do this accurately for most of the country. So the... or a... camera is reading roadside signage? The GPS data alone is woefully inaccurate and never fully current; a timely update infrastructure doesn't exist.
Then there's the tin-foil hat side of this, the "optional" thing. You'd actually voluntarily enable your car to record when and where you're violating the law, albeit a minor one? What happens when it's no longer optional? We had long and intense conference room debates about this aspect of our car data recording, and resolved nothing. Knowing what's in the sausage I find this particular "feature" a bit frightening.
Then there's the tin-foil hat side of this, the "optional" thing. You'd actually voluntarily enable your car to record when and where you're violating the law, albeit a minor one? What happens when it's no longer optional? We had long and intense conference room debates about this aspect of our car data recording, and resolved nothing. Knowing what's in the sausage I find this particular "feature" a bit frightening.
The camera does read the road signs and pretty well I have found. There have been several constructions zones go up on my way to work that have temporary speed limit signs posted and not all totally uniform, and the camera picks them up no problem. Usually just a handful of feet beyond the sign it will display the speed limit.
Unfortunately the car is recording your speed anyway. Almost all new cars (if not all now) have an Event Data Recorder that constantly records multiple variables (Event Data Recorders (EDRs) | NHTSA) Theoretically a court could subpoena that data for a host of reasons. Frightening to me too, and that is also why I will never have one of those insurance company OBD plug-ins to record how "safe" of a driver you are.
There are several links out there but here is one where you can check to see if a particular car has an EDR EDR Vehicle Search – McNally & Associates
2021 ID.4 AWD Pro S Gradient Scale Sliver/Black and 2022 GTI Autobahn DSG Silver/Black
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I’ve had 4 Audi/VW cars with ACC. They all act this way. My theory is that when you set the ACC, your speed is v+ a fraction. If that fraction is >.5, it may show as the next mph up because the speedometer does not show fractions but rounds up to the next whole number.
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Thank you, John! And I completely forgot about EDRs, and that's after evaluating EDR metadata docs in my project suite! Retirement does that, ya' know.
Spot on about the insurance company OBD "dongles". Is there an appeal process when they class you as "assigned risk" after reading your plug-in? Doubt it.
Big Brother is not the government, it's corporations that can make you or break you financially. The whole Equifax scandal, for instance. Before the traffic data gig I worked for a personal data collection company, developing software and processes to automate data mining from non-computer sources, mostly phone books and other print media. When I found out my work product was being sold to Acxiom, the baddest data scraper you never heard of, I adjusted my career plans and moved on.
Waze is unique in that has an army of volunteer map editors that help keep data up to date on the maps including speed limits. I have personally "fixed" all the speed limit issues on my typical drives. Updates to the maps are rolled out to the fleet within 2-3 days. Other mapping systems are way out of date in comparison.
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Waze is good conceptually in the same way AirBNB, Uber, Lyft and Bird are, but they only function where the people are, i.e., in metro density. When your life is mostly deep rural or even moderately-sized (15K) rural towns in "flyover" country, these otherwise great ideas fall completely apart. Where we live there are no AirBNB opportunities in a 60 mile radius and there is no Uber or Lyft here nor any traditional taxi service - data-driven stuff most of you take for granted now. DoorDash has one driver in our town, which was a real problem during the pandemic peak. And like I said elsewhere here, the closest VW dealer is an hour away.
IOW, I doubt the army of Waze volunteers are plying the backroads of rural America, on roads where you might see half a dozen vehicles a day, where the "official" speed limit might change through a village of 200 and is otherwise not posted. There's a whole lot of fixed, paved infrastructure that even escapes things like cell coverage - we had to change providers recently because Verizon or partner local cellcos were totally unavailable on one of our frequent 300-mile drives.
Heck... I was a principal engineer on one traffic data project that used anonymized cell pings to survey traffic speeds. The project was shut down the week of the press release due to public outcry, as somebody else figured out on very-low-traffic roads it was pretty easy to triangulate on individual identities by their movements and locations alone.
Community and other hive-oriented data collection concepts are nice until you get past the exurbs or off the Interstates. Then you're simply just lost.
IOW, I doubt the army of Waze volunteers are plying the backroads of rural America, on roads where you might see half a dozen vehicles a day, where the "official" speed limit might change through a village of 200 and is otherwise not posted. There's a whole lot of fixed, paved infrastructure that even escapes things like cell coverage - we had to change providers recently because Verizon or partner local cellcos were totally unavailable on one of our frequent 300-mile drives.
Heck... I was a principal engineer on one traffic data project that used anonymized cell pings to survey traffic speeds. The project was shut down the week of the press release due to public outcry, as somebody else figured out on very-low-traffic roads it was pretty easy to triangulate on individual identities by their movements and locations alone.
Community and other hive-oriented data collection concepts are nice until you get past the exurbs or off the Interstates. Then you're simply just lost.
No system is going to perfect everywhere all the time.
For instance pre-covid when I commuted everyday I would use a combination of Waze and the Model 3 built in nav to find the quickest route to or from work. Some days I chose the Waze route, some days the Model 3, more often than not a combination of both.
As for Waze only being useful in high density locales, think again. When Waze rolled out their speed limit campaign, they did not activate speed limits in regions until the percentage of roads marked with a speed limit reached a minimum threshold. WME's were challenged to get their local area up to spec so that the speed limit feature could be activated in their region. The point is that Waze do use metrics to direct WME's to update maps in paths less trodden, it isn't random, it is well organized and directed.
Its easy to find fault in an system. Waze has the most up to date map bar none. Is it perfect? No. Point me to a system that is.
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