neither have I heard them called that. Maybe a regional thing.
New Jersey Median Barrier History. The New Jersey Median Barrier is the tapered concrete barrier that is used in many narrow highway medians, to prevent vehicle crossovers into oncoming traffic. ... The first concrete median barrier used in New Jersey was installed in 1955, and it was only 18 inches tall.
Prior to 1955 they simply had Chris Christie lie down on the highway. Hence the Bridgegate Scandal. (Kidding.)