Have you ever been blown over, or met anyone who's been blown over, by a semi? I doubt it. I've ridden in traffic for years, and maybe it's that I'm going fast enough, or that the semi's going slow enough, but getting blown over by other traffic has never been a problem for me. Strong winds off of Lake Michigan have made me nervous, but when I fall off my bike it's always because I'm a dumbass but the wind is perfectly still.