The advantage of these completely retractable V4A stainless steel bollards over rigid concrete bollards is obvious. During the day, they can be lowered, allowing delivery traffic and craftsmen to enter the street unhindered. At night, when partygoers stroll through the Große Freiheit in their thousands, the bollards provide secure protection against vehicle attacks.
As a special feature, the entire system can be controlled and monitored from the control center of the Davidwache. This allows all bollards to be raised and lowered centrally, either simultaneously or individually. This central control becomes particularly important in emergency situations, such as during the deployment of the fire department or other rescue vehicles.
The extremely durable and maintenance-free V4A security bollards were professionally installed and can withstand even an extremely strong impact from a heavy truck. Another special feature is that a massive steel cylinder automatically wedges itself into the lifting piston every time it rises and is only unlocked again by controlled lowering. In comparable systems, just a few stacked paving slabs are often enough to lower the bollard or break it. The bollards used in Hamburg even resist severe sabotage, such as cutting the pressure lines. Even with massive force, the bollards cannot be lowered uncontrollably.
