(225 ILCS 440/3.07)
(from Ch. 121, par. 503.07)
"Sign" means any outdoor sign, display, device, notice, figure
painting, drawing, message, placard, poster, billboard, or other thing, which
is designated, intended, or used to advertise or inform, and of which any
part of the existing or intended advertising or informative contents is or
will be visible from any place on the main-traveled way of any portion of
an Interstate or primary highway and which is within 660 feet of the nearest
edge of the right-of-way of such highway.
"Sign" also means any sign described in paragraph one of this Section
which is more than 660 feet from the nearest edge of such highway, outside
of an urban area, visible from any place on the main-traveled way of any
portion of such highway and erected with the purpose of its message being
read from such main-traveled way.
(Source: P.A. 79-1009.)