Jersey barrier

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Jersey barrier

n.
A protective concrete barrier used as a highway divider and a means of preventing access to a prohibited area.

[From the fact that they were first used on the New Jersey Turnpike, an important toll road in New Jersey .]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.