I recall a Google exec following Google maps in the winter in Oregon and it cost him and his family their lives. A good road in the summer ain’t necessarily so in the winter.
It was a CNET editor named James Kim. He missed a turn and took the wrong road, no mention of GPS leading him astray. His wife and kids survived.
http://www.cnn.com/2006/US/12/07/missing.family/index.html
There may have been GPS used, but I don't recall.
Google maps in my area routes people over SR 120, Tioga Pass, into Yosemite Nat’l Park, which is fine, except it is closed for 6 months of the year due to snow. Lot of people have tried it during Winter using Google maps. They don’t get far.