Why Can't My Car Tell the Speed Limit?

I got a ticket on my way to the Guy Kawasaki event yesterday--34 in a 25. I wasn't trying to speed--I simply wasn't paying attention. Here's my question: why can't my car tell the speed limit and warn me when I'm over? Seems simple enough to do in theory. You wouldn't need to annotate the roads physically, you could do it with GPS and maps. I'd pay for this service.

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Last modified: Thu Oct 10 12:47:19 2019.