APPARATUS AND METHOD FOR SELECTIVELY PROVIDING OR PREVENTING ACCESS

摘要

Apparatus and method are disclosed for selectively providing or preventing access of a moving object moving from a first region to a further region. The apparatus includes a first abutment surface arranged to abut with a moving object moving from a first region to a further region; and a further abutment surface arranged to selectively abut with and thereby prevent a moving object moving from the first to the further region; wherein the first and further abutment surfaces are spaced apart to enable a moving object having a footprint less than or equal to a predetermined area to pass unimpeded from the first to the further region.