"I am thinking this is about 40 years out of date. Of course, I came from an almost all white small town so using as a reference to other ethnic groups was not a option.
I was more in thinking current usage is like in the movie…"
"If you contact the highway department because a particular sensor does not work, offer this suggestion. Take a sign blank (12*18 inches). Place an edge on the center or edge loop, and hold it upright. Adjust the sensor toward more…"
"If it has a middle section, over the middle section similar to #3.If it has just two sides, either side should work. Left side if turning left, right side if going straight or turning right as in #3.If it doesn't have the pavement…"