Following Google Maps directions in rural Tasmania and encountered this sign.

Y'know though, if you report a problem to Maps, they can and will fix it.
There's a closed bridge in a town nearby, it's been closed for almost 3 years waiting for state funding to repair it, but nobody, not even the town highway department thought to report it to Google, so Maps routed over it all the time.
I reported it, and 3 weeks later it showed up as closed.
It may be flawed, but it's dynamic.