Here in the UK it does adjust the speed limit for adaptive cruise control. sometimes it works well and other times not so much. As has been mentioned it’s high risk when it spots a much lower limit and adjusts immediately when you’re cruising along at 80mph.
Mine has read speed limits in car parks I’ve passed at 10 mph and adjusted and here in the UK lots of urban areas have 20mph limits with signs at the turn in to the respective road. Mine is forever picking them up and slowing me from 50, 40 or 30 mph very abruptly.
Also a new source of irritation last week was 60mph roads in Scotland with a 40mph for trucks. Guess what mine decided to do every time it saw a 40mph for trucks sign, hmmm
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