Patent ID: 7547157

Claim:
A barrier device, comprising: a top wall, a bottom wall, opposed side walls and opposed end walls interconnected to form a hollow, closed interior, each of said walls having an inner surface located within said hollow, closed interior and an outer surface; a layer of foam material substantially entirely covering said inner surface of each of said top wall, said bottom wall, said opposed side walls and said opposed end walls, said layer of foam material forming a unitary structure within said hollow, closed interior which is affixed to each of said walls to enhance the structural integrity of said walls, an open area being formed within said hollow, closed interior which is bounded by said layer of foam material extending along each of said top wall, said bottom wall, said opposed side walls and said opposed end walls; a ballast material at least partially filling said open area, said layer of foam material being effective to resist leakage of ballast material from said open area within said hollow, closed interior through said walls.