pp. Displaying a homemade banner, particularly one with a political message, from a freeway overpass or similar location.
2009
For two years on his evening commute, Bleiweiss watched members of the Progressive Action Alliance on the bridge over U.S. 59 at Mandell protesting Israel with virulent signs. Although increasingly bothered by them, he did what most people would do: He silently fumed but didn't act on it. Then one day in March 2008, fed up with the increasingly anti-Semitic tone of the group's signage, he decided to take action against what he calls "freeway blogging."
2007
Hanging homemade banners from overpasses—"freeway blogging" is the catchphrase—is also popular with political activists. States seem to have less tolerance for them, as two protesters in DuPage County, Ill., found recently after suggesting impeachment on a bridge over Interstate 355. A disorderly conduct hearing is set for this week.
2003 (earliest)
Freeway blogging [image].
The pioneer here is a fellow who calls himself the Freeway Blogger (see freewayblogger.com), who is (in)famous for his roadside signage in southern California.