Looking at Lima's map, I noticed many roads were just lots of unconnected ways. It seems they come from a huge import from "Telcom IP". Comparing it to the Bing imagery is even more scary as at some places it seems it's completely unrelated (although the imagery seems correctly aligned other where). At these places it seems it'd better to delete all of it!
Quite a few streets are named but it's all uppercase. And the streets without (known) name got named "S/N", probably standing for "without name". This could probably be fixed by a script. Moreover, many streets are cut into very small ways with the same name. Sometimes they are also duplicated.
The imagery is precise enough to permit to fix a lot. In some places, like Piura, there has been some clean up already going on. A lot more love could go on. So, to everyone looking to do some armchair mapping during a rainy day, keep Peru in mind :-)