Here below is a cool photo collection that shows people posing with signs from between the 1920s and 1960s.
Dumping Prohibited. State Highway, circa 1920sHoney (Over there), circa 1920sPay As You Ride, circa 1920sJust me, August 23, 1927Park Here, December 10, 1929Go-Slo-School, circa early 1930sScotland, circa 1930sBald Head, circa 1940sDanger – Soft Shoulder, California, circa 1940sDevils Den, Gettysburg, Pennsylvania, circa 1940sNo Dogs Without A Leash, circa 1940sOff Limits, circa early 1940sReserved US Army Air Force, circa 1940sIdaho, 1942“I Love You”, 1946England – Berwick – Haddington, circa 1950sLas Vegas, circa 1950sMississippi River, 1950Mississippi, circa 1950sMontana, circa early 1950sNo Smoking, circa 1950sOklahoma, circa 1950sRough & Ready, circa 1950s“The Thing?”, circa 1950sThis First, circa 1950sThirsty. Drive at Night. Plenty of Moonshine, July 1956Florida, March 1957F.E Wall, 1958I’m Evil, circa 1960sMontana. Welcome! 1960Roadside – Rest Area, September 1962“Why Hate?”, April 1962“Chicken, all you can eat $1”, June 1963Howard Johnson’s Motor Lodge, June 1963September 1964“Ubehebe Crater” – Death Valley National Park, CA, 1964Showers Resort, 1968Las Vegas, August 4, 1969