Google Maps is just a live traffic data set now. I use it during my commute, and its ability to tell me the speed limit of a road segment is deteriorating over time. Google doesn't need any fancy machine learning algorithms to work out what the speed limit of a road is; they just need to work with local governments to get their databases of speed limits. The whole product increasingly reeks of issues that couldn't be replicated in an open-plan office in Mountain View, so probably aren't real.
"Google Maps is not up-to-date enough on the speed limits along the route I drive 10 times per week" is among the dumber complaints I've read. Google of course does what they can to update speed limits. Coverage varies[1]. Some content on Google Maps is provided by government content partners[2].
