Talk:Megurine Luka V4X/@comment-107.132.71.41-20161025013112/@comment-53539-20161029145859

Mostly its the non-native English voicebanks, the natives or "Engloids" can pronounce it well. I wouldn't say Luka is the worst though...

A road roller itself is a vehicle used for leveling surfaces such as roads.

https://en.wikipedia.org/wiki/Road_roller

Its a reference to the Kagamines road roller meme.