Number of sections in roadway huge!

[daringd 2]

I have created a roadway LOD and upon applying the surfaces to it the number of sections jumps from 1 when I have only one texture applied, to 11 when I apply two further surface textures.

 

There are three surface textures applied to the mesh and I have a total of 11 sections.

 

I have double and triple checked all of the faces and made sure there are no other textures of materials applied.

 

Any ideas?

 

D