Protective barriers

thumb|upright=1.35|The Battlement|crenellated parapet on a bastion of [[Kyrenia Castle, Cyprus]] A parapet is a barrier that is an upward extension of a wall at the edge of a roof, terrace, balcony, walkway or other structure. The word derives from the Italian parapetto (parare 'to cover/defend' and petto 'chest/breast'). Where extending above a roof, a parapet may simply be the portion of an exterior wall that continues above the edge line of the roof surface, or may be a continuation of a vertical feature beneath the roof such as a fire wall or party wall. Parapets were originally used to de

bar or pole pivoted on a fixed support to block vehicular or pedestrian access through a controlled point

at train station platforms, a door that separates the platform from the train, due to architectural constraints, climate control, and/or for safety

barrier installed within medians of and next to roads to prevent vehicle collisions

fence or barrier consisting of one or more horizontal rails and vertical supports

modular concrete or plastic barrier

type of net that catches falling debris or people

a submerged net placed around beaches to reduce shark attacks on swimmers

protective barrier for young children

wire rope used as a safety barrier

component which prevents passage into a dangerous area, commonly used to mitigate risk