1A rail that prevents people from falling off or being hit by something.
- With the boat beached and the bow tilted up, a guard rail prevented him from taking aim at the enemy.
- It was amazing to see men, women, and children alike chasing the moving bus, hopping on to the steps, then pulling themselves into the vehicle by using the guard rail or the door as a level of sorts.
- If not, consider putting up a guard rail or steel posts to reduce this risk.
1.1North American A strong fence at the side of a road or in the middle of an expressway, intended to reduce the risk of serious accidents.
- The vehicle skidded and collided with the interstate guard rail.
- Above us, the guard rail of the elevated east-bound lane was shredded, making it look like the Lincoln had torn through it and nose-dived into the bus.
- The driver lost control under icy road conditions, the van hit the guard rail and flipped over.
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