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A transportation barrier is a natural barrier like mountains, rivers, oceans, etc that blocks or slows the way of transportation.
Wedge and Plate Barriers. Concentric Securityâs wedge and plate barriers are used to protect against a variety of vehicle threats. These wedge and plate barriers have been designed and crash tested to meet the DOS K12 (ASTM M50/P1) specifications. This type of barrier has become the flagship of the high security industry.