It started with the e-bikes and now I have seen some bikers with that plastic shield like a roof that extends down in front and at the back. It's hard to describe but maybe I will be posting a photo next time when I chance upon a rider with that plastic shield. I have not heard of an accident yet but for sure it is a risk to have that plastic shield on the bike. When you are moving and a strong wind hits you, there is the tendency for you to lose balance and suffer a crash. Maybe it's just a novelty of a present craze but I'd still say that it is not safe.