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I didn't know these were a thing, but saw a good video the other day on them:
https://youtu.be/krVt_Uzm5Qs
pifko-
Mine is a Ford and doesn't set to 80 on the motorway but does get very confused sometimes. For example there is a bit of the M1 near Hemel that has a parallel A road with a 50 limit. The camera sees that and all power disappears until you either kick down or turn it off. Self-driving cars need to not make that kind of mistake.
The camera got equally confused by the A2 contraflow with the lorry queue on the other carriageway with a different limit.
Blooming marvelous in roadworks with speed restrictions usually.
jellybaby
Speed limiters that adjust to the local limit are coming in the EU, and the UK. All new type approvals from the summer and all new cars in a couple of years IIRC. I've had one in my car for the last 4 years.