I agree that you don't find out if you truely like someone until you've traveled with them. When traveling with people you find out a lot about them, and get to know them well. you may come to find that you grew tired of them more quickly than exprected you would, but riding somewhere together, especially for any good amount of distance can make you more on edge. The smallest thing may annoy. On the other hand, you may come to find out that you enjoy the person's company you are traveling with. However, I do believe that taking a trip with someone will decide if you truely like them or not.