I noticed that in your capture too. If it's due to the standard cause, you just need to enable AF (anisotropic filtering) in your graphics card control panel. Both nViida and ATI/AMD should offer this option. With nVidia you can enable either globally or in the Oblivion profile. Not sure if ATI/AMD offers that flexibility, not owning one.
If your GPU is reasonably new and powerful, don't be afraid to enable AF at or near its highest setting. On such cards AF doesn't have near the performance hit of high-quality AA. If your initial setting proves too costly you can almost back off a bit.
With AF enabled your roads and ground-in-general will be in sharp focus rather than blurry as they are now. That might or might not make tiling more noticeable. If it remains objectionable your best option is to install higher quality road/cobblestone textures. I can't offer any specific recommendations since the one I use is no longer available for download.
I agree, regarding anisotropic filtering: it is worth a few FPS. I run it at 16x, but then I do own a very new AMD GPU, which I imagine helps considerably to offset the impact. And yes, said AF does help with many distant landscape issues.
Also make sure "Suface Format Optimization" is
off. Or, if you own an Nvidia card, there might be an equivalent thing to watch out for.
The other thing I would say about QTP3 roads is that they are horrid. Luckily, several modders have created alternative roads, some even designated for use with [the rest of] QTP3.