I usually switch off speed recognition as it seemed better at looking up side roads than straight ahead. Also the A9, which we do a lot, has numerous 50mph signs for lorries, and that doesn't help. I haven't really tried it with the latest firmware update.
BUT.... I think you may have found the cause that so many people somehow seem to think their human rights are being removed, and are unable to do less than 35 in a 20mph zone. At the front of our minds at the moment as herself saw a campervan in the village this morning doing, shall we say, it's own speed, while the driver was trying to read a map propped up on the steering wheel.
Where's the software update for that?