One in, one out policy
Encyclopedia
A one in, one out policy is a method used to control the number of people in one place or building at any one time. Where a place or building has reached its maximum capacity
Seating capacity
Seating capacity refers to the number of people who can be seated in a specific space, both in terms of the physical space available, and in terms of limitations set by law. Seating capacity can be used in the description of anything ranging from an automobile that seats two to a stadium that seats...

, further entry is only allowed upon a person leaving. It is especially used in nightclub
Nightclub
A nightclub is an entertainment venue which usually operates late into the night...

s and bar
Bar (establishment)
A bar is a business establishment that serves alcoholic drinks — beer, wine, liquor, and cocktails — for consumption on the premises.Bars provide stools or chairs that are placed at tables or counters for their patrons. Some bars have entertainment on a stage, such as a live band, comedians, go-go...

s, and most military
Military
A military is an organization authorized by its greater society to use lethal force, usually including use of weapons, in defending its country by combating actual or perceived threats. The military may have additional functions of use to its greater society, such as advancing a political agenda e.g...

establishments.
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