| 摘要 |
<p>A supermarket security installation including a floor surface with upstanding projections or ridges (30) designed to inhibit the wheeling of trolleys across them. So that the projections or ridges (30) do not hinder or endanger a person walking across them, they are of limited height and the trolleys are designed or adapted in such a way that abutment elements (22) thereof strike the projections or ridges (30) to bring the trolleys to a halt.</p> |
