>You need boots on the ground, so to speak, to see that new speed limit sign or the new lane paint.
It'll shock you to know that you can simply get this from governments, some even provide this in API form
no visual data, you need picture data for that. companies like NC tech do it for like $1m a city. or thereabouts.
> or the new lane paint.
I'd be surprised if this is a thing outside the biggest US (and European, for that matter) cities, judging from Google StreetView there are lots of streets in US cities/towns with almost no paint lines at all.
It probably won't shock you to know that those sources of data can be months to even years delayed from what's actually out in the world.