guard rail

Từ điển Oxford Advanced Learner 8th

ˈguard rail [guard rail guard rails] BrE NAmE noun
1. a rail placed on the edge of a path, a ↑cliff or a boat to protect people and prevent them falling over the edge
2. (NAmE) (BrE ˈcrash barrier)a strong low fence or wall at the side of a road or between the two halves of a major road such as a ↑motorway or ↑interstate
See also: ↑crash barrier