My pal Greg saw this sign in an antique mall in Denver, and sent me a photo, asking if I wanted it (thanks, iPhone!!) He brought it over today. Crazy long shot I know, but I thought I'd see if anybody on here might have an idea of from whence it came. If not, just enjoy it instead!
Carlsbad Raceway here in San Diego had the same sign-. verbatim, but in a more modern (non hand painted) form. Either that's Carlsbad's old 1960's-early 70's sign or the wording (which sounds like it was attorney crafted) was a common/standard Drag Strip liability release posting for Drag Strip owners to post at their track. Such a suggestion may have been crafted by AHRA, NHRA or a Drag Strip owners membership group. Yours is a way cool sign. Scroll down the page for a pic of the Carlsbad sign. There's a button at the top of the page to email the website admin. http://www.carlsbadraceway.org/Drags.html
The lawyers must have been involved in the drag strips back in the day. I was able to "acquire" this sign and some letters off the timing tower at Detroit Dragway back before they closed it down in 1998.
I'm pretty sure LACR had the same sign, or one just like it. VERY cool. Of course these signs didn't stop either racers or spectators from suing! I think NHRA tickets used to have this printed on them, I've got a bunch going back to the 80's, someday I'll dig 'em out and take a look. Great sign!
I have several similar signs, but they are in plastic, from the early 80's, and required by NHRA at Bremerton Raceway at the time, that I helped to operate for 4 years. I also have several other wall hanger signs, one from the Bangor Submarine Base here in Washington State; it ends with the warning/wording, "USE OF DEADLY FORCE IS AUTHORIZED", printed in red. The fences surrounding my yard are decorated with old traffic, business, and other signs, along with old hubcaps/wheelcovers, mud flaps from big trucks, deer antlers, and other obscure objects of my eclectic tastes. Lots of rusty farming/industrial type stuff decorate other areas. One of my neighbors across the street absolutely hates it all; I say she can fornicate with herself using barbed wire. She was out in her "side yard", that is basically a trench of rocks and designated as an easement for the water towers behind her house by the city, using an electric weed eater to knock down the tall grass/weeds. Since that day, she has been named, "the Bitch in the Ditch", sort of a, "new from Ronco", sales line. Wish I could post pics. I am Butch/56sedandelivery.