Replacing Road Textures

I'm trying to default replace the road textures in game. Specifically those in Brindleton Bay. I've gone through using the game file cruiser and tracked down all teh road textures, made an empty package, added them and then replaced each image. I've also tried replacing the textures on the debug roads. Neither of these have worked. Is this a know issue? Can roads not be replaced? Do they work differently somehow than the terrains?