Editing Crash bar (section)

=== Justification for use ===
{{Quote box|In virtually all [crowd crush] situations it is usually the authorities to blame for poor planning, poor design, poor control, poor policing and mismanagement. <!--This is a verbatim quote. It must not be changed. -->
|author= Edwin Galea, professor of fire safety engineering at the [[University of Greenwich]], England<ref>{{cite news |title=Crowd crushes: how disasters like Itaewon happen, how can they be prevented, and the 'stampede' myth |work=[[The Guardian]] |date=1 November 2022 | first=Samantha |last=Lock |url=https://www.theguardian.com/world/2022/nov/01/how-do-crowd-crushes-happen-stampede-myth-what-happened-in-the-seoul-itaewon-halloween-crush}}</ref>
 | align = right
 | width = 33%
}}
By the end of the 20th century, most countries had [[building code|building codes (or regulations)]] which require all public buildings have a minimum number of [[fire exit|fire]] and [[emergency exit]]s. Crash bars are fitted to these types of doors because they are proven to save lives in the event of [[human crush]]es. Panic can often occur during mass building evacuations caused by fires or explosions.

In the event emergency exits are required, the crash bar works efficiently to allow people to pass through security doors without a reduction in speed. A crash bar's fast-acting mechanism reduces the risk that a rushing crowd might suddenly become a logjam at the exits. Such a human crush, which has [[List of fatal crowd crushes|many historical precedents]], can cause falls, crushing, and other injury because the rear of a crowd has no idea that the people at the front of a crowd are impeded by a door.

Crash bars are typically found on doors which are required emergency exits serving a particular type or quantity of occupants. Common locations include doors which provide egress from assembly areas, doors which serve many occupants, or doors serving hazardous areas. For buildings subject to the [[International Building Code]] or a locally adopted variation, they are required for certain healthcare, education, or assembly spaces, generally related to the number of occupants expected to exit quickly through a given door.<ref>{{cite book|title=2009 International Building Code|year=2009|publisher=International Code Council, Inc.|location=Country Club Hills, Illinois|isbn=978-1-58001-725-1|page=1008.1.10}}</ref>