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IMO, I don't think it should. The street I live on has 3 different speed limits, depending on what part you're on. There's a 30, 40, and 45. The 40 is sandwiched for 2 blocks between two 45 zones. And what about roads that don't have speed limits. I argued, in court, over a speeding ticket I got, that the cops were giving tickets in an unmarked speed limit zone for a road that varies on the speed limit big time (still found guilty), but it's poorly marked.
Re: Waze should tell you the speed limit of the road you are