Abstract art? That's one way to explain it.
Ok, dude, you need a LOT of help. Patch meshes, curves, etc can be a real pain. I'll try to give you a little of my experience/tricks.
First off, ROADS. It seems to me that some of the road textures DO NOT make good curved roads...never look right. Also, most of them have to be laid out left to right on the screen, not up/down. Steps to take:
1. Find a texture. Is the image in your texture menu vertical or horizontal? MAKES A BIG DIFFERENCE. Also, make sure to note the WIDTH of the texture image. IF it is a square, it is a 512x512, if it is a rectangle, it is most likely a 256x512. This matters.
2. Make a brush based on the direction of the texture. If it's a vertical, then your brush should be vertical too. DIMENSIONS: Ok, now from step (1) size the brush accordingly... Let's assume it is a 256x512 texture and vertical. Make your brush 256 units wide and say 1024 tall.
3. Go to the 'Curve' menu and select 'Patch Mesh'. Now, I assume you know that you can select the number of rows/columns in a mesh. I usually would go with 3 columns on a 256 wide brush and 5 on the 512 wide brush. Rows I keep to 3 or 5 for every 512 units, depending on how many bends you want to make.
4. Now you've got your mesh. You know how to bend it, I see. But the textures are a nightmare. To 'fit' your textures, just hightlight the mesh and click 'Natural'; this almost always fixes your problem, even AFTER bending it. Remember, not ALL textures work well.
BIGGEST ADVICE!!!!: DO NOT USE just meshes to make all of your roads. IF you at all can, use them only for complicated bends, elevations, etc. Meshes add tons of triangles=low FPS.... Use regular brush work and LOD when possible. LOD and MESHES do not block VIS, so an underlayment of caulk brush can help too. It can be a pain blending meshes into other brushes/LOD, but it will run much better.
Keep at it, it took me a long time to mostly-master. Curves....ugh. That's still a struggle for me sometimes...weather, planet alignment, all that needs to be perfect!
