Long road, long cable, a bridge, a long wall, fence… most environment assets that use the copy sop create a challenge for me when it comes to texturing and therefore UVs.

To make sure I get the most of the 0 to 1 UV space, I want to have one UV island representing the original geometry that has been copied, and place the UV islands of the other copies on top of the original and on top of each other. Any idea how I can place the UV island on top of each other?

If you assign the uv coordinates to the original, then all the copies will share the same uv space. Is this what you meant :

-b