The tech I’m talking about isn’t related to speed limits, but zones where pedestrians, particularly children, are much more likely to be in the street.

when you exceed the speed limit the car automatically notifies the government so they can find you.

I assume you meant “fine”; regardless, why is there a need for that in order to enable the second piece?

You can opt-in to have the car automatically control you top speed so you don’t get fined.

Change that to “You can enable a feature that will automatically reduce your set cruising speed (or, if you’re not using cruise control at that point, give you tactile feedback on the accelerator foot pedal) when you enter an area where pedestrians are in the street or are expected to be in the street (i.e., there’s a cross walk up ahead and a pedestrian has triggered it).” Or, to summarize similar to what you said: “You can have the car automatically reduce your speed when necessary so you don’t kill people.”