This happened to an Uber driver when I was a passenger, too. He needed to get off the highway and then turn left, he got off the highway and Google Maps told him to make a u-turn, so he crossed the (paved) median and got onto the on-ramp. Once we passed the hotel, Google Maps told him to stop and let me out... still on the on-ramp. We had to turn off the mapping and turn on some common sense.