Move the object over a given path

How to move an object at a given path? Without the use of a "wall"?

I was looking for an answer, but not found right topic. I set a picture that explains the trajectory. Thanks

One way to do that path exactly could be:

https://dl.dropboxusercontent.com/u/542 ... ollow.capx

It could be made to move at a constant speed by splitting the curve up into lots of lines and make the time to move on each line proportionate to it's length.

There are other solutions too:

search.php?keywords=follow+path&terms=all&author=&sc=1&sf=all&sr=posts&sk=t&sd=d&st=0&ch=300&t=0&submit=Search

Thanks a lot! This really helped me to solve the problem.