Hi
I found a inspiration to make diagonal roads look good (http://imagizer.imageshack.us/a/img537/677/VlX5Hu.jpg), but mine look like this (http://i.imgur.com/l0waJjU.jpg).
The Mod used is RRP Wooden Fences, how can i fix that?
I'll bet those lots use overlay textures without a proper base texture, which results in the screen shot you posted (aka, the 'water bug'). The only (temporary) fix is to click on one of your overlay screens (like 'underground' view, zone view, ect) and then back again - this should clear up your problem. But that is only a temporary fix, as it will show up again after you save or leave and come back to the tile.
That did the trick, thx ;D