barrier (a bar, wall, fence, or gate that stops people or vehicles from entering a place): The crowd had to wait behind barriers.
barricade (a temporary structure placed across a road, path, etc. to prevent people from getting through): Police erected a barricade across the road.
railings (a fence or barrier made from metal bars): He chained his motorcycle to the park railings.
obstacle (something that blocks your path): The only obstacle in our way was a tree trunk in the road.
obstruction (something that blocks a road, entrance, or pathway): We are trying to remove trees and other obstructions from the path.
roadblock (a barricade put across a road to stop traffic): The army set up roadblocks to check passing vehicles.
hurdle (a barrier for jumping over in a race): The horse fell as it jumped the first hurdle.
