http://www.npr.org/blogs/thetwo-way/2012/10/11/162712149/motorists-beware-zombies-ahead
Motorists Beware! Zombies Ahead!
Unsuspecting motorists got either a shiver or a laugh yesterday morning in Portland, Maine as they drove by a construction site whose warning sign had been hacked: instead of the typical caution, they were told 'Warning Zombies Ahead!'........................................................
http://www.huffingtonpost.com/2012/10/11/zombie-apocalypse-sign-road-maine_n_1957273.html
Maine drivers warned of zombie danger
............................................................But see, also, circa 2009-2011: