I can't really share any studies, but some people seem to have more info: https://news.ycombinator.com/item?id=30195371

Intuitively it would make sense that being able to see in front of you with no obstruction would have an impact on safety. How much, I can't say ¯\_(ツ)_/¯

> School buses typically have a large nose in front of the driver. Are they unsafe?

Guess what, European buses don't have a nose, either :-)))