| 主权项 |
1. A system, comprising:
(a) first and second platforms comprising at least one set of wheels; and (b) at least one wall section engaged with the first platform and the second platform, defining an area protected from vehicular incursion; (c) wherein the at least one wall section includes a plurality of structural members, with an outer skin that faces traffic and provides a planar surface to direct impacting vehicles away from the area protected from vehicular incursion and at each end of the at least one wall section, an end plate is connected to the plurality of structural members; and wherein a weight of the at least one wall section is at least partially offset by a ballast that is movable, along a fixed path, from one side of the first and/or second platform to the other side. |
