I wasn' t really sure where to put this topic, and finally decided here in Camping...
I'm a member of Escapees and the following information is courtesy of their newsletter:
To date, nine states have enacted highway signage laws helpful to RVers. Those states are Florida, Tennessee, Louisiana, Texas, New Mexico, Iowa, Michigan, and Washington. Oregon is listed as an “experimental” state, having not yet confirmed to RVIA (Recreational Vehicle Industry Association) that the use of the RV-friendly signs is law.
The RV friendly logo—a bright yellow circle with the letters RV—alerts RVers to highway-side facilities that cater to the special needs of RVs at specific highway exits. When RV friendly logos are included on the logos of qualified establishments, motorists know that those businesses will provide parking facilities that accommodate RVs.
To check on the status of this initiative in other states, use the search engine at http://www.rvact.com/rvact/dbq/officials/
.To identify (and contact) elected officials in your home state who may sponsor legislation about implementing RV-friendly roadside signs.