A bollard apparatus for use as a vehicle barrier comprising: a plurality of bollard members; a plurality of separate foot members each adapted for ground engagement by placement upon or embedment within a ground or floor surface, to one or more of which is attached at least one bollard member of said plurality of bollard members upstanding therefrom, wherein at least one foot member of said plurality of foot members comprises: a front edge; a rear edge; at least one lateral edge (5, 6) which opposes a corresponding lateral edge (5, 6) of a neighbouring foot member of the plurality of foot members, wherein the at least one lateral edge (5, 6) extends between the front and rear edges and is non-planar so as to comprise: a first edge part (5A, 6A) thereof; and, a second edge (5B, 6B) part thereof that is laterally offset from the first edge part (5A, 6A), wherein the bollard apparatus further comprises a coupling assembly (4A, 4B) forming an articulated coupling which couples the at least one foot member of the plurality of foot members to a neighbouring foot member of the plurality of foot members, wherein the coupling assembly (4A, 4B) is attached to the lateral edge (5, 6) of the at least one foot member of the plurality of foot members; characterized in that the first edge part (5A, 6A) of the at least one foot member of the plurality of foot members is laterally offset from the second edge part (5B, 6B) of that at least one foot member of the plurality of foot members by a lateral offset exceeding the maximum separation between the opposing edge parts of the first pair of coupled opposing edge parts permitted by the articulated coupling (4A, 4B). a plurality of bollard members; a plurality of separate foot members each adapted for ground engagement by placement upon or embedment within a ground or floor surface, to one or more of which is attached at least one bollard member of said plurality of bollard members upstanding therefrom, wherein at least one foot member of said plurality of foot members comprises: a front edge; a rear edge; at least one lateral edge (5, 6) which opposes a corresponding lateral edge (5, 6) of a neighbouring foot member of the plurality of foot members, wherein the at least one lateral edge (5, 6) extends between the front and rear edges and is non-planar so as to comprise: a first edge part (5A, 6A) thereof; and, a second edge (5B, 6B) part thereof that is laterally offset from the first edge part (5A, 6A), wherein the bollard apparatus further comprises a coupling assembly (4A, 4B) forming an articulated coupling which couples the at least one foot member of the plurality of foot members to a neighbouring foot member of the plurality of foot members, wherein the coupling assembly (4A, 4B) is attached to the lateral edge (5, 6) of the at least one foot member of the plurality of foot members; characterized in that the first edge part (5A, 6A) of the at least one foot member of the plurality of foot members is laterally offset from the second edge part (5B, 6B) of that at least one foot member of the plurality of foot members by a lateral offset exceeding the maximum separation between the opposing edge parts of the first pair of coupled opposing edge parts permitted by the articulated coupling (4A, 4B). a front edge; a rear edge; at least one lateral edge (5, 6) which opposes a corresponding lateral edge (5, 6) of a neighbouring foot member of the plurality of foot members, wherein the at least one lateral edge (5, 6) extends between the front and rear edges and is non-planar so as to comprise: a first edge part (5A, 6A) thereof; and, a second edge (5B, 6B) part thereof that is laterally offset from the first edge part (5A, 6A), wherein the bollard apparatus further comprises a coupling assembly (4A, 4B) forming an articulated coupling which couples the at least one foot member of the plurality of foot members to a neighbouring foot member of the plurality of foot members, wherein the coupling assembly (4A, 4B) is attached to the lateral edge (5, 6) of the at least one foot member of the plurality of foot members; characterized in that the first edge part (5A, 6A) of the at least one foot member of the plurality of foot members is laterally offset from the second edge part (5B, 6B) of that at least one foot member of the plurality of foot members by a lateral offset exceeding the maximum separation between the opposing edge parts of the first pair of coupled opposing edge parts permitted by the articulated coupling (4A, 4B). a first edge part (5A, 6A) thereof; and, a second edge (5B, 6B) part thereof that is laterally offset from the first edge part (5A, 6A), wherein the bollard apparatus further comprises a coupling assembly (4A, 4B) forming an articulated coupling which couples the at least one foot member of the plurality of foot members to a neighbouring foot member of the plurality of foot members, wherein the coupling assembly (4A, 4B) is attached to the lateral edge (5, 6) of the at least one foot member of the plurality of foot members; characterized in that the first edge part (5A, 6A) of the at least one foot member of the plurality of foot members is laterally offset from the second edge part (5B, 6B) of that at least one foot member of the plurality of foot members by a lateral offset exceeding the maximum separation between the opposing edge parts of the first pair of coupled opposing edge parts permitted by the articulated coupling (4A, 4B).