Anti-ram barriers are protection measures against a criminals or terrorists attack with use of vehicle driving high speed into the direction of the premises. Many times the vehicle might be filled with explosive device.
What road blockers do? Types of premises
Road blocker has to stop the enemy. Hostile Vehicle Mitigation (HVM) measures mechanical protection anti-ram barriers designed to stop and damage the attacking vehicle and not allow or minimize penetration into the secured area. The types of premises, which might be subject to such risks are: airports, stadiums, administration centers, embassies.
The anti-terrorism vehicle barriers might be divided into
a) Active/manual operations or automatic operations blocking devices, with pneumatic, hydraulic or electro mechanical drive, such as automatic bollards, hydraulic road blockers, wedge barriers etc,
b) Passive/ fixed items such as fixed anti ram bollards, fixed anti ramming fences.
Another axis of division is the time for which the device is being installed:
a) Permanent devices will be mostly embed into concrete foundations
b) Mobile or temporary devices
When we look at the way the devices are fixed we can divide them in the following way:
a) Shallow mount installation
b) Full depth installation
c) Overground installation
This is a very general division, and there are multiple examples of devices, which are not suitable for one category only and one device has properties from different categories.
Most popular active and automatic vehicle stopping devices, used to secure the premises against an attack are:
a) Road blockers
b) Wedge barriers
c) Blocking bollards
d) High security arm barriers
e) Tyre killers barriers
f) Anti-ramming sliding, swing and folding gates
g) Horizontal lift beams