A crash barrier is a strong low fence built along the side of a road or between the two halves of a motorway in order to prevent accidents.
[British]regional note: in AM, use guardrail
crash barrier in British English
noun
a barrier erected along the centre of a motorway, around a racetrack, etc, for safety purposes
Examples of 'crash barrier' in a sentence
crash barrier
They drove ahead of him on the other side of the crash barrier and flashed their lights to warn oncoming cars.
The Sun (2014)
They were wide and flawless, with a central partition, their sides protected by crash barriers.
Oliver Poole BLACK KNIGHTS: On the Bloody Road to Baghdad (2003)
The area is now an embankment that blocks noise from a dual carriageway and is topped by a monument made from Lancaster parts and motorway crash barriers.
Times, Sunday Times (2010)
These medicines have become the gold standard in the US and are more cost-effective than motorway crash barriers or air bags in our cars.