People unclear on the concept - GPS v/s emergency highway signs

If I was going somewhere and following directions on a GPS unit and I saw a sign saying Road Closed; I might want to reconsider my choice of routs. From the other ABC News (Australian Broadcasting Company):

Family rescued after GPS blunder
A family of four and their dog spent four days bogged in mud in far west New South Wales after being led astray by a GPS unit.

Police say the driver drove off the road while following instructions from the GPS on Thursday.

They say the GPS instructed the driver to travel along a closed road near Wilcannia, and the driver ignored the road closure signs.

Weather conditions prevented police from getting to the family sooner but they were finally rescued last night.

Sergeant Fisher from Broken Hill Police Station says a rescue team from Wilcannia was finally able to get them out yesterday.

"[The crew] braved extremely difficult and treacherous road conditions and travelled out there," he said.

"They actually slid off the road quite a few times and almost got bogged themselves."

Police say the local council may fine the family for damage done to the road.

And I am wondering just how many years it will take Daddy to live down his little experiment with infallible technology... I am guessing close to ten but by then, the event will be nostalgic so they will revive it and tell the story over and over a second time.