From Roads to the Future :
"The "Zipper Machine" is rather impressive; it's a huge truck-like device that lifts the movable concrete median barrier about 6 inches off of the roadway, shifts it over, and then places it back down onto the roadway.""Jersey-type median barriers weigh 500 pounds per linear foot or more, so it takes a large powerful machine to perform this task, and it moves at 3 to 4 miles per hour."
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