Hey Kildor, glad someone else is working with them! The corners you want aren't made yet. They can be assembled from existing textures, but no tile exists. I'll be happy to whip it up as soon as I can. Haven't had much free time lately, but should be able to in the next few days.
Is there a particular corner you want or should I just make all four 90 degree turns? As they're done now, they'll be blocky on the outer turn. You'll see what I mean when I do it, but perhaps we can look for another solution at some point if you think it looks too bad.
If you're in a hurry, check out the 2ln_crnw* tiles. They are the outside edge of a 90 degree turn. One is currently not done correctly, but I'll get it fixed soon.
Also, I've built them specifically for my big city RMA and focused on just what I needed first, but if there are any other things you want let me know. I hope we can expand the street set greatly in the long term. So if you wanted roadside parking, bike lanes, etc., shouldn't be too difficult to do.