单词crash barrier
na.: 〈英〉(置于快速公路中线的)防撞栏
网络: 护栏；防撞护栏；防撞隔离墩
（高速公路或州际公路上的）防撞护栏，防撞墙:
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
〔英国〕(置于快速公路中线的)防撞栏
Ideally, the cars slide along this wall or crash barrier and dissipate energy and speed.
理想上，赛车沿着这面墙或者是防撞护栏消散冲击力和速度。
Analysis on and prevention of the "pockmark" disease of crash barrier
防撞护栏“麻面”病害的分析与防治