yeah, that must be it.
at least I've ridden many miles sharrowed streetscape in three states and have ample experience with them and aren't simply talking out my ass about sharrowed streetscapes like some posters to this thread.
to commuterrun? you mean i can't say bikelanes or shoulders are better suited than sharrows as bike transportation facilities for high speed, narrow laned roads on public rights of way?
why not? The FHWA would be in agreement with my statement, so would AAA, as well as likely any transportation engineer just about anywhere.

seriously, dude, I feel for your limited vision. don't get around much, eh?