1) Emergency management 
A crash bar (also known as a panic bar, exit device, panic device, or a push bar) is a device for unlocking a door during emergency conditions. The mechanism consists of a spring-loaded metal bar fixed horizontally to the inside of an outward-opening door. When the lever is either pushed or depressed, it activates a mechanism which unlatches the d...
Many motorcycles have a Crash Bar or guard to protect the bike should it fall over. You'll have to l
The bar on the backside of a door that unlocks it. These must be installed for health and safety reasons, though sometimes opening them triggers an alarm.