crash barrier—a barrier erected along the side of a road or between the two halves of a motorway to prevent accidents:
- The lorry hit the crash barrier and overturned.
crush barrier—a (temporary) barrier for restraining a crowd:
- It was the day of the Ibrox Park disaster when 66 fans died leaving the ground when a crush barrier collapsed.
Note: The expression does not correlate in meaning with the phrase crush bar—a place in a theater for audiences to buy drinks in the intervals:
- In the second interval he made his way to the crush bar.