Ok, I Googled (lol) this and it and part of the problem is the British press has to worry more about being sued than the American press does.
"Our girls ask how and why their daddy died, and I'm at a loss for words they can understand," the man's widow said.
abc7chicago.com
It's not just the family who "alleges" there was no signage. The cops who arrived at the scene also said this. No signs. No barriers.
And I don't know if this has anything much to do with the State/local gubernment either. A private company was responsible for this bridge and road. It doesn't sound like any drivers should've been there.
Google absolutely was told about this error before the crash. There are receipts that they received the error report. They didn't update their Maps service.
So it sure looks to me like Google directed a driver on to private property, and then...off a cliff, in the middle of a storm.