(LOL), I'm like you, I couldn't tell one from the other! Don't worry, you don't have to. The cars are all arranged in different, well-marked areas of the parking garage. You will see signs for Full Size, etc. Also, at least when we used them, there are attendants walking around to help you if you need them. All in all, it was a great experience, much better than waiting in a long line and then having to wait for your car. We will be using EA again on our next trip!