On the topic of fake road signs, there's the famous story of Los Angeles artist Richard Ankrom making and installing a perfectly-crafted modification to a freew

On the topic of fake road signs, there's the famous story of Los Angeles artist Richard Ankrom making and installing a perfectly-crafted modification to a freeway sign on the 110 to provide better directions to I-5. For months nobody realized the sign was "fake". Caltrans ended up liking the sign and left it up for 8 years before replacing it with a "real" one. http://www.laweekly.com/2009-12-31/la-life/richard-ankrom-s-freeway-art-caltrans-buys-into-the-prank/full/ http://www.laweekly.com/2009-12-31/la-life/richard-ankrom-s-...