How many times have you wondered how strong those cement barriers are that you see in front of military base entrances? Read below and then view the attachment. 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 following test, the following parameters were used. Truck weight = 65,000 lbs. Speed at impact = 50 m.p.h. Kinetic Energy = 5.5 million foot pounds Stopped in 24 inches
