Patent ID: 7931422

Claim:
A barrier segment which is hollow and adapted to be filled with a fluent material for ballast, comprising: a molded plastic container having outer walls defining an interior volume and having a first end and a second end; a plurality of connecting lugs disposed on each of said first and second ends, so that a plurality of barrier segments may be joined together; a drain aperture in a lower portion of one of said outer walls of said barrier segment for draining fluent material disposed in said interior volume; a closure for closing and sealing said drain aperture; a recess disposed on said barrier segment outer wall, surrounding said drain aperture, having a depth sufficient so that when said closure is engaged with said drain aperture to close same, an outer surface of said closure is approximately flush with adjacent non-recessed portions of said outer wall; and buttress threads disposed on an interior surface of said drain aperture; and threads disposed on an outer surface of said closure, for engaging said buttress threads to secure said closure sealingly relative to said drain aperture, said buttress threads being coarse and square cut, with flat edges; wherein said outer walls have a plurality of sawtooth segments disposed thereon, which are arranged vertically and extend outwardly and downwardly in order to deflect vehicles impacting the barrier segment in a downward direction.