I used to ride with one of these as a kid in the UK - pretty sure it didn't extend to the recommended 3' safety zone...
I've come to notice that the majority of motorists that pass me too closely drive vehicles with out of state plates. New arrivals unfamiliar with Illinois laws?
Personally, I think I'll just start sporting one of those "dog cones." That ought to make me "more visible" to motorists, significantly reduce my aerodynamics, AND make me look like a completely dork.