crash barrier

World English Dictionary
crash barrier
 
n
a barrier erected along the centre of a motorway, around a racetrack, etc, for safety purposes

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
crash barrier

noun
a strong protective barrier that is erected around a racetrack or in the middle of a dual-lane highway in order to reduce the likelihood of severe accidents 
WordNet® 3.0, © 2006 by Princeton University.
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