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Section 9 of AASHTO's "Standard Specifications for Structural Supports
for Highway Signs, Luminaires and Traffic Signals" manual has a
discussion on deflections that might be useful to you. It's only one
page long and I can fax a copy to you if you would like.

Calvin Lee, P.E.
City of Portland, Oregon

> I have a billboard with two flagpole type column supports.  The sign
> has 
> about 450 square feet of surface about 20 feet up in the air.
> 1.  Does anyone have any recommended deflection criteria for
> billboards? 
>  The sign I'm looking at will have people around it most of the time.
> I 
> think AASHTO has a code on it, but I can't find it right now.  I know
> you do 
> not want the vibration to be perceptible in moderate winds (say 30
> mph), yet 
> probably will accept perceptable deflection for maximum wind (70 +
> mph).
> 2.  Does anyone have names & phone numbers & contact person for
> billboard 
> sign manufacturers.  I can find flagpoles in Sweet's (10350), but not 
> billboards.  I've heard that the flagpole supports are tapered partly 
> because it damps out any potential resonance (variable moment of
> inertia = 
> variable natural period) under wind loading.  I wanted to call and
> learn 
> more.
> Thanks
> Steve Uthoff, S.E.