Dear EnzoCro,
I think if you try to do this, we will end up with endless questions and answers.
You should go to some nice tutorials in the internet or you can begin modelling with the tutorial in gmax gamepack fs2004 or use gmax tutorial file at turbosquid.com
http://www.turbosquid.com/gmax. You don't need to make a model related to flightsim but any models you can learn something more. Repeat texture is the one I learnt from this tutorial. You don't need tiles to make it repeat along its length of texture.
I made a plane with 3 segments on the width of the plane.
Then I use your texture to map on the plane
Put number on the box I indicated, you will see how the texture repeat itself along the length. You can put number to make it repeat along its width as well.
Unwrap it and see how it is. The vertex of the texture is stretch far beyound the boundary of the texture. That is how it repeat itself on the length.
Now you can adjust the vertex of the edge of runway. If you see that the texture is not repeated enough, you can add more repetition by adding more numbers to the vertex. Number 0 is the left corner of the texture, number 1 is the right edge of it. So, if you put 10 to it the texture will be repeated 10 times.
Now I'm done with the edge. Texture does not look stretching as yours.
I'm sorry if my answer irritate you but please take my advice. Go to turbosquid.com and download their tutorial. You will learn a lot while doing the models and examples that they provided.
If you keep asking, we will end up with hundreds of mini-tutorials like this one.
Of course, it takes time before you master and understand all the method of making model in Gmax. But be patient, scenery designing is not easy and lots of projects are abandoned along its development.
Regards,