One of the biggest problems will be if it can’t be overridden. My S-Max has automatic camera derived speed limiting, the problem is, it often gets it wrong, staying at 30mph when its 60 or changing from 70mph on a dual carriageway to 40 in a blink of an eye then returning to 70 some miles later, for no reason, just imagine the car slamming on brakes to bleed 30mph…rear end shunt anyone? Thankfully it can be turned off – I can see the speed limit shown on the dash, but its my choice to stick to it or disagree if , clearly, the system is being stupid.
Then there is the safety aspect, sitting at a limited 40 in a 40, older non-speed limited truck comes up behind you, driver texting or watching porn, you can see it coming, but can’t escape…
In life, it's not who you know that's important, it's how your wife found out.