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I’ve used the speed limit assist since once I’ve had my 2019 E300 and it’s really been a big help.
BUT
In June there was navigation update and since then the speed limits showing in the instrument cluster and the speed limit assist are wrong. The road I live on has a speed limit of 45 mph but the car reads it as 15. I took a trip last week and every time I had to use an exit to get on another interstate it would read the speed limit as 80 mph. I can be driving in a construction zone on the interstate where the speed limit drops to 55 mph which the car will adjust to but then all of sudden a mile or two later it will shoot up to 70 mph without any speed limit sign indicating a speed change.
is anyone else having this problem with the last update?
I've had similar issues, but they are related to time sensitive speed limits such are found in school zones. It may be that speed limit control takes into account GPS location.
I haven't noticed any issue with the latest update, but to be honest, I'm not paying all that much attention to the speed limit in the instrument cluster. I've disabled the automatic speed limit adoption for DISTRONIC, so I only have the speed limit displayed as a piece of mind and have it set to blink if I exceed the speed limit by 5 mph or more. It blinks frequently anyway . But so far haven't caught it showing the wrong speed limit.
It sounds like the speed limit data is wrong in the latest map update for your region. Generally, the speed limit comes from the camera when it "sees" speed limit signs, but if it hasn't seen a speed limit sign for a certain amount of time, it falls back to what the map data says for the current road you are on. So it sounds like whenever it decides to fall back to the map data, the speed limit it gets from the database is wrong.
I’ve used the speed limit assist since once I’ve had my 2019 E300 and it’s really been a big help.
BUT
In June there was navigation update and since then the speed limits showing in the instrument cluster and the speed limit assist are wrong. The road I live on has a speed limit of 45 mph but the car reads it as 15. I took a trip last week and every time I had to use an exit to get on another interstate it would read the speed limit as 80 mph. I can be driving in a construction zone on the interstate where the speed limit drops to 55 mph which the car will adjust to but then all of sudden a mile or two later it will shoot up to 70 mph without any speed limit sign indicating a speed change.
is anyone else having this problem with the last update?
Was navigation update OTA or dealership installed? I did OTA update earlier this year and everything seems to work as before. On local/city/county roads the system reads the signs, posts the proper limit on the dash, and controls the vehicle speed accordingly. Too accurately as UA549 points out. "Hey Mercedes"...school's out for summer. I'm not sure why it doesn't seem to care on freeways, but that's another story.
Was navigation update OTA or dealership installed? I did OTA update earlier this year and everything seems to work as before. On local/city/county roads the system reads the signs, posts the proper limit on the dash, and controls the vehicle speed accordingly. Too accurately as UA549 points out. "Hey Mercedes"...school's out for summer. I'm not sure why it doesn't seem to care on freeways, but that's another story.
I have seen similar issues since my car was new. I still leave the display on to indicate what the car thinks is the speed limit, but I disabled the option to automatically update my cruise control speed when it thinks the speed limit has changed. That function is downright dangerous.
I was traveling on the highway, and the speed limit was 65mph. The car suddenly started slowing down pretty quickly, because it somehow thought the speed limit had changed to 25. There were cars right behind me, and I found it to be unsettling.
Porsche Cayman S, Mercedes W213, Nissan Titan, BMW X5, Chevrolet Suburban
Originally Posted by E300-18
I have seen similar issues since my car was new. I still leave the display on to indicate what the car thinks is the speed limit, but I disabled the option to automatically update my cruise control speed when it thinks the speed limit has changed. That function is downright dangerous.
I was traveling on the highway, and the speed limit was 65mph. The car suddenly started slowing down pretty quickly, because it somehow thought the speed limit had changed to 25. There were cars right behind me, and I found it to be unsettling.
After this happened the third time I disabled the automatic speed update cruise control feature. I too leave the speed display activated and often contrast the speed showing on Android Auto with the W213's cameras.
If there's no way to update the car so that certain places aren't showing dramatically lower speed limits having this feature active is downright dangerous.
I've had weirdness with my 2017's speed limit assist, but it's been pretty consistent since I bought it in 2021. I've also noticed that it will have the same quirks at the same spots on some regular drives, like jumping up to an 85 mph speed limit at one specific spot in the road near Georgetown, DC, and bumping down to 35 at one spot on the highway back from Dulles. Construction zones often cause problems with it.
I wish I could figure out exactly what causes the phantom quirks (sometimes it's a badly-placed and/or -designed road sign - those I get), but I've just learned to ignore them. I can anticipate the few regular ones and the unique ones are fairly rare. I still like the feature and use it + ACC almost all the time, even on busy city streets.
FYI, one feature that I think not many are aware of, is that you can always manually adopt the current speed limit as the stored speed instead of having it adopt the speed limit automatically. Simply press RES while DISTRONIC is active and it will set the currently displayed speed limit as the stored speed. I use this all the time. As said, I've disabled the automatic speed limit adoption, and instead manually adopt the speed limit as I see fit. I usually use this to set the initial stored speed and then adjust up by my usual 10-20 mph and only adopt the new speed limit if it's significantly lower and I don't have a car ahead of me setting the pace already. This makes for a much more with the flow of traffic driving.
What I'd really love is an option to have RES adopt the current speed limit + 8 mph! I always set my ACC using that method, but I'll tolerate the glitches: I like having the car slow itself down when the speed limit actually changes. If the glitches increase, my view of the system would change; I'm hoping it continues to work okay as the car ages. (I like to buy nice cars a few years old and keep them for a decade or more.)
What I'd really love is an option to have RES adopt the current speed limit + 8 mph! I always set my ACC using that method, but I'll tolerate the glitches: I like having the car slow itself down when the speed limit actually changes. If the glitches increase, my view of the system would change; I'm hoping it continues to work okay as the car ages. (I like to buy nice cars a few years old and keep them for a decade or more.)
If this option was available, I *might* use it. It would at least provide some convenience at times. As it is, I always need to override the automatically set speed anyway, since I don't drive the exact speed limit. The only benefit I could see is if the speed limit is significantly lowered and I don't notice. It might save me from a speeding ticket.
If I don't happen to know the current speed limit, I still like to see the car's opinion of the speed limit on the dash. I sometimes find myself checking the dash when driving another vehicle that doesn't have this feature. Having the car automatically update the cruise control speed is somewhere between useless and dangerous for me.
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. But so far haven't caught it showing the wrong speed limit.
