Works of art using vernacular sign iconography

Works of art using standardized iconography found in vernacular signs :
 * Ari Kletzky, Islands of L.A. project, reclaiming traffic signs (2008-present): An artist that literally works with actual signs, Kletzky has been changing traffic signs in L.A., tweaking the messages so that (e.g.) a "STOP" sign now says "Don't STOP making art. The link above is the first installment of a series of signs to create a fictional "Islands of LA" national park (more info).
 * Stanley Marsh 3, mock road signs in Amerillo Texas, another, one more (1990s): Marsh actually created his own road signs and placed them up in various public places. Eventually he faced legal trouble and was tried at court.
 * Thundercut, Boom Box Walker(2000s): one of the NYC graffiti artist's various artistic alterations of pedestrian walk signs. Vernacular iconography like the pedestrian walk signs were initially designed for not only practical or functional purposes (easily recognizable to have a universal system of signs), but also political (the non-racial icon is generalizable to almost anyone and thus politically correct). Thundercut specifies the generic icon, giving it specific recognizably racial or gendered features and character.
 * Ed Rusha, Standard Station, Amerillo, Texas (1963): The pop artist Ruscha drew his first inspiration as an artist by photographing vernacular road signs from his road trips across the country, and ever since he has displayed an aesthetic obsession with vernacular signage of all kinds, from books, to commercial advertisments for products such as spam, gas station signs--things so banal and ubiquitous that most would dismiss them as boring (and Rusha's oeuvre seems altogether dry and deadpan in its sentiment).