100 is attached to adjacent plates via two interconnecting members 5 that are for example round and pipe shaped that interconnect the plurality of plates 100 fig3 is a side view of the second exemplary embodiment of a plate 200 the plate 200 comprises a rounded top portion 210 feet 200 and 230 and interconnecting members 25 in this particular exemplary embodiment the interconnecting members 25 are bar shaped and can be for example tubular or a solid member constructed out of any type of material the rounded top portion 210 provides a less aggressive top portion that while still maintaining the functionality of the barrier 1 may be more appropriate around highly populated areas or areas where a large number of personnel may be in close proximity to the barrier 1 fig4 illustrates a third exemplary plate 300 the exemplary plate 300 comprises a top spiked portion 310 feet 320 and 330 and interconnecting members 35 and 45 in accordance with this exemplary embodiment the top portion 310 has two or more spike shaped protrusions that provide a more aggressive barrier 1 and can for example provide additional stopping power as the barrier is rotated onto the top portion upon contact by a vehicle furthermore the exemplary plate 300 is interconnected.