What are the types of physical access controls?

Physical access controls restrict entry to facilities and sensitive areas. Deterrent controls discourage attempts and include fences, lighting, signs, and security cameras. Preventive controls stop unauthorized access and include locks, mantraps or security vestibules, turnstiles, and biometric readers. Detective controls identify unauthorized access and include motion sensors, security cameras, intrusion alarms, and security guard patrols. A mantrap or security vestibule uses two interlocking doors where the first must close before the second opens, preventing tailgating.