the present invention examples may include but should not be limited to bolts u clamps rods pins or the like the manner in which the barrier sections connect together should therefore not be seen as being limiting temporary plastic barrier section 1 also includes a rigid straight elongate member in the form of steel bar 7 the steel bar 7 passes through the interior of plastic shell 2 and spans from first connection portion 3 to second connection portion 4 the steel bar 7 includes two apertures at each end thereof which align co axially with the leading 5 a 6 a and trailing 5 b 6 b apertures in each of the first connection portion 3 and second connection portion 4 manufacture of shell 2 can be performed by way of rotary molding the apertures 8 a 8 b through which the ends of steel bar 7 protrude are formed in the shell after rotary molding by way of cutting a slot in the shell 2 thereby forming a passage through the shell 2 through which steel bar 7 can be passed fig3 shows a further embodiment of a barrier according to the present invention as generally indicated by arrow 100 the barrier 100 includes a connection portion having two protruding members 101 102 on one end and three protruding members on the other end not shown the barrier 100 includes an aperture 8 through which a rigid straight elongate member not shown can be inserted into the shell 102 in the embodiment of fig3.