My VW wrongly reads a speed limit off of frontage roads instead of my actual road every single day. When the car was new I tried the speed limit beeper just to see and it isn't worth it.
The speed limit display is great for simple highways and I appreciate the warning when I reach a speed zone, but not ready for anywhere complicated.
In some countries the speed limit can change without a explicit sign (speed limits cancelling out at intersections / changes in pavement, etc.). In my experience, in multiple instances the systems offered a speed limit that is higher than the actual one, which can be dangerous if you're just blindly trusting the clanker
The signs also seem to take priority over GPS, I was on a road with a 50mph speed limit tonight and the car read something it thought was a 20mph speed limit sign. I have the beeps disabled but it still displays the red 20mph sign on the dash to let me know it thinks I'm breaking the law.
The speed limit display is great for simple highways and I appreciate the warning when I reach a speed zone, but not ready for anywhere complicated.