headache bar
n.— «The city added a height restriction, designed to eliminate most of the trucks that would also violate the weight limit. They installed what’s euphemistically called a “headache bar,” a section of PVC pipe strung across the road.» —“Many drivers ignoring signs” Colorado Springs Gazette (Colorado) Nov. 4, 2006. (source: Double-Tongued Dictionary)
Further reading
Understanding the varieties of conversational styles can mean the difference between feeling you’re understood and being insulted. “High-involvement” speakers interrupt or talk along with someone else to signal their enthusiasm...
Amid court-ordered busing in the 1970s, a middle-school teacher tried to distract her nervous students on the first day of class with this strange assignment: find a monarch caterpillar. The result? A memorable lesson in the miracle of metamorphosis...