We were on vacation in a part of the country we are not very familiar with and relied on Google Maps to tell us the way. On the last leg of the trip back home there were two routes, one were significantly faster, so we chose that and ended up driving several miles over a mountain on gravel roads. Luckily it was mostly in good condition. :-)

It was worse when Google Maps tried routing us around traffic by sending us off the highway and down on narrow roads through neighbourhoods and side roads. Poor people living there suddenly had a main road along their homes. This kind of thing should be regulated.