Letter Re: Anti-Vehicular Barriers for Retreat Defense
Jim, This video is rather impressive. The video description reads: “How many times have you wondered how strong those cement barriers are that you see in front of military base entrances? From time to time someone asks what the concrete barriers are in front of controlled and secure buildings. When they are told that the barriers will stop traffic, even trucks, from approaching the secure building, they usually get a look of disbelief. In the test, the following parameters were used: Truck weight = 65,000 pounds. Speed at impact = 50 m.p.h. Kinetic Energy = 5.5 Million foot-pounds. Stopping distance …