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A transportation barrier is a natural barrier like mountains, rivers, oceans, etc that blocks or slows the way of transportation.
K-rail concrete barrier. Yes, it is not strictly a tool, but it has become ubiquitous. K-rail - California's version of the New Jersey Type 50 concrete barrier is inescapable if you are driving in this state.trictly speaking, K-Rail is a temporary barrier with a slightly different shape from the extruded concrete Jersey barrier that CalTrans uses as a center divider on urban freeways. Newer CalTrans Jersey barrier appears to have a steeper angle on the sides and it is noticeably taller.