How cars of other intelligent species may look like

There's only a limited chance that the conditions on any other planet than earth may have fostered live, evolution and the development of intelligent species. Now, let's assume the people there had a similar history to ours and finally came into the age of individual mobility. How would there cars look? Here's an example from Planet 51. Well, it's quite disappointing. Despite being light years away and having gone through a very different evolution cycle the cars of greenish Planet 51 people look pretty much like what we had in the 60ties, let's say with a Ford Thunderbird. Even the steering wheel is on the left side, so it can be assumed that they drive on the right side of the road. Is all of this caused by the lack of imagination of the film director or does evolution have to happen like this? Is there kind of a Darwin type of theory that intelligent species will always develop eventually colorful multi-seat convertible cars to be driven on the right side of the road with a steering wheel?
Think about it, I think we are up to something that might qualify for the Nobel price!