Make texture blend only to the left and right side in my material

In my material i have 2 textures the first in the primary which is the dirt road texture and the secondary texture is just regular dirt is there a way i can blend these two textures together but only make it happen to the left and right side of the material ??

Use Lerp with some texture mask or procedural mask

https://docs.unrealengine.com/udk/Three/MaterialMasks.html

If anyone else runs into this thread, this is how I solved it:

The lower part adds optional noise to the blend. Plug the clamp output into the alpha of a lerp between your two textures.

NB. You may want to use UGradient instead of V depending on how you use the material.