Perimeter security or perimeter protection is a security solution that uses physical and software technology systems to protect against unauthorized access and intrusion to safeguard people, places, and property.

The primary goal of perimeter barriers is to protect a facility with a limited number of access points that can be easily and proactively controlled. In some cases, standard fencing may be sufficient to protect the site and keep out potential intruders or animals.

Surveillance systems with ALPR modality placed at the entrance to car parks provide access control for registered vehicles, ensuring that they can only enter if there are empty spaces available.