I just saw a few launch photos & a video of various 2018 F1 cars. I immediately noticed halos have been incorporated into the cars.
I viewed the 2018 rule [email]changes at:
https://www.formula1.com/en/latest/technical/2018/1/what-are-the-new-f1-technical-rules-for-2018-.html
I was curious as to whether or not these devices obstruct the drivers vision due to their design.