How do fences walls and locks control access to a property?

Fences, walls, and locks are fundamental components of physical security, designed to protect property by controlling access through tangible means.1

Perimeter Barriers

Fences and walls serve as perimeter barriers that define the boundaries of a property and physically block unauthorized entry. By creating a physical obstruction, these structures deter illegal entry and help manage traffic patterns, effectively limiting the number of available entrances and exits to a site.21

Locks

Locks function as specialized mechanisms to prevent or control access to specific areas or items, such as doors, safes, or files. They operate by using internal components—such as tumblers, slides, or pins—that must be manipulated into a precise configuration by a correct key or combination before the bolt can be withdrawn. Modern locks have evolved to offer high levels of security, including:13
* Lever and Cylinder Locks: Use keys to align internal parts to specific heights.3
* Combination Locks: Utilize rings or dials to align internal slots, offering high security without a keyhole that could be vulnerable to tampering.3
* Advanced Mechanisms: Some locks incorporate magnetic forces or specialized designs to resist picking and forced entry.4