bear against the concave surface 64 u2032 of the second coupling element 44 u2032 the neck section 66 u2032 of the second coupling element 44 u2032 has sufficient length so that it extends somewhat beyond the opening 48 of the inner cavity 46 the barriers 10 and 10 u2032 are pivotal relative to one another along their cooperating pivot surfaces 56 60 and 64 u2032 respectively in either the clockwise or counterclockwise direction until the neck section 66 u2032 of the second coupling element 44 u2032 of barrier device 10 u2032 engages the stop 54 or stop 58 of the first coupling element 42 of barrier device 10 the barrier devices 10 10 u2032 may travel through an angle relative to one another of somewhat less than the 45 u00b0 spacing between the stops 54 u2032 58 u2032 due to the thickness of the neck section 66 e g about 22 5 u00b0 in both the clockwise and counterclockwise directions but such extent of articulation is far superior than barrier devices currently commercially available as a result the overall barrier wall 70 formed by alternating barrier devices 10 and 10 u2032 can assume a comparatively sharp curve when positioned along a roadway or the like while the invention has been described with reference to a preferred embodiment it should be understood by those skilled in the art that various changes may be made and equivalents substituted for elements thereof without departing from the.