For speed limits, the obvious technical problem is knowing when they end, if they apply to your road, or maybe a parallel road or an off-ramp, which is mostly easy for a human to tell, but much harder for a camera.
Even though the camera may be better on average processing all this information than the average human driver, it's an unanswered question, from a legal point of view, who's responsible when the camera is wrong.
Volvo has recently taking a stand proclaiming legal responsibility, but it remains to be seen if that's even a possibility in many nations.
There may be some jurisdictions where this is the case, but in most I'm familiar with it is fairly well settled that the human driver of a car is legally at fault if the car is driven in violation of the law, and the human driver of the car is also legally responsible for assuring that all mechanical features of the car are maintained so as to not interfere with the human drivers ability to assure that the car is driven in accordance with the law.
(In many jurisdictions, the manufacturer may have liability for accidents and injury due to manufacturing defects, but that doesn't generally absolve the driver for being responsible for driving consistently with the law.)
It is very possible to get a speeding ticket well below the legal limit. It isn't common, but where fog/snow/ice/rain are a factor I have seen cops hand them out to idiots. And 'conditions' can include the condition of your vehicle. Driving with bald/track tires in the rain can result in an 'unsafe speed' ticket should a cop see you slide.
You could say that the ultimate responsiblity lies with the driver, but taking this position effectively means that all self-driving features are pointless (since this implies that the driver should be concentrating on the driving at all times).
If the responsibility lies (partially, at least) with the car manufacturer, they are going to get a lot of lawsuits thrown at them when it gets the speed limit wrong. Every speeding ticket, every accident where the car was going too fast, etc.
"Hey, is it a school day?"
"No, we take a couple days off before exams."
"Oh. It's a good thing then that we haven't ticketed anyone."
"But doesn't the law say 'normal school day'? It is a friday."
"Ya, but your school ain't normal."