A: A wedge barrier is a type of active vehicle barrier that sits in a flush position with the surface of the ground. Most wedge barriers are surface mounted or buried in the roadway. Recently, some manufacturers have developed a mobile wedge barrier that can be towed to specific locations for rapid deployment. When the wedge is in the up position, wedge barriers lock in position forming a wedge shape to block oncoming traffic. Wedge barriers are very effective for stopping gate runners and locking down entry/exit points against terrorist attacks. K12 Defense Consultants has developed an electro-mechanical retrofit that replaces all hydraulics in existing barriers that are prone to leaks and breaks. Many military installations and government buildings are moving away from hydraulic barriers and upgrading their barriers to electric. No more hydraulic line breaks, spills or mess from oil spills.