It's normally on a motorbike to shield the rider from wind.
Windshields are for cars. Most motorcycle riders call them Fairings over here.
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It really helps when the weather starts getting cold and especially for BUGS during the summer, Its not fun getting smacked between the eyes by a splattering dragonfly. The bugs probably aren't as bad in Europe bc of the lower humidity.
Just look what they call football.
Its much better than a bunch of fairies running around in circles kicking a ball. They should get an Academy Award for the acting job as well. They barely get touched and fall to the ground in agonizing pain. lol We call it Soccer and only little kids play it over here. The best thing about that so called "sport" are the Hooligans!