When you take a vacation, lots of things can go wrong that create major problems. Anyone who travels, for example, has waited in a long rental car line even when they had a reservation. Some of us have even gotten to the front of that line and realized that the car we had reserved wasn't actually there. In the age of Uber and Lyft that no longer means you're stranded, but a transportation problem can put your travel plans into disarray. Yes, you can arrange rides to wherever you are going, but people pla ...