Chain barriers operate on the principle of chain tensioning and laying on the ground. They are suitable for garages or entrances between 5 and 50 meters in length, where other access systems are difficult to close. Their ability to raise and lower the chain in as little as 2 seconds makes them suitable for use in areas with high traffic flow. In chain barrier systems, the upward and downward movement of the chain can be controlled by special connecting elements placed at predetermined intervals on the ground over long distances such as 50 meters. This restricts the movement of the chain against external interference, preventing vehicles from passing under or over it. In chain barriers with automatic lifting, the barrier automatically raises the chain after a vehicle passes. The chains are thick, galvanized load-bearing chains with high tensile strength. The chain does not tension until the vehicle leaves the chain axis laid on the ground; this is ensured by a photocell safety measure. The chain is re-tensioned after a vehicle passes over it. This safety measure prevents damage to the chain barrier and vehicles. In high-speed vehicle collisions, the chain, thanks to its special connecting elements, detaches from the support post, preventing damage to the motor and control unit. Chain barriers are a sought-after product for sequential parking areas and stand out among their counterparts with the economical solutions they offer.