Hydraulic bollards are a type of security barrier that is designed
to control vehicular access to a restricted area. They are
typically installed in high-security locations such as government
buildings, military installations, embassies, airports, and other
critical infrastructure sites.
When the bollards are in the lowered position, vehicles are able to
pass over them without obstruction. However, when the bollards are
raised, they create a physical barrier that prevents vehicles from
entering or exiting the restricted area.