A modular system includes a post and first and second rail segments. Each of the first and second rail segments includes a tube defining a substantially hollow interior with an internal surface and an external surface and a web connected to the internal surfaces of the tube and extending across the hollow interior thereof. The web includes at least one screw boss configured for receipt of a fastener to enable engagement of the rail segment with the post.

An arrangement for attaching a falling post on a base structure, the post being rotatably movable between a standing and a recumbent position. The arrangement includes a stand, wherein the post is attached pivotally to the stand by a pin. The stand includes at least one groove arranged laterally in respect to the post, and the post has at least one projection extending in a lateral direction from the post. The at least one groove is arranged with respect to the at least one projection such that when the stand is in the standing position, the at least one projection lies in the at least one groove and thereby locks the post in the standing position. The at least one projection is attached to the post such that it may move with respect to the stand in a longitudinal direction of the post.

A movable railing assembly includes a first railing segment having a first bogie and a first barrier coupled to the first bogie. The first bogie is configured to engage a track positioned below the first barrier and to facilitate movement of the first railing segment along the track, and the first barrier is configured to block access across the first railing segment. The movable railing assembly also includes a second railing segment having a second bogie and a second barrier coupled to the second bogie. The second bogie is configured to engage the track and to facilitate movement of the second railing segment along the track, and the second barrier is configured to block access across the second railing segment. Furthermore, the movable railing assembly includes a connector coupling the first railing segment to the second railing segment.

A modular clamp system includes a first component and a bracket. The first component includes a web defining a body having first and second channels orientated towards one another and defining a first height between exteriors thereof and a second height between interiors thereof. The bracket includes a base having first and second flanges extending from opposite ends thereof, a frame extending from the base, and defines a third height between ends of the first and second flanges greater than the second height and less than the first height. A portion of the bracket is configured for insertion into the first component in a first orientation and is further configured for rotation relative to the first component such that the first and second flanges are respectively received within the first and second channels to engage the bracket relative to the first component.

A shelter includes a body having a wall. A stairs and platform system is connected adjacent the wall of the shelter. The stairs and platform system includes a platform and a stair assembly. The platform includes: (i) first and second spaced-apart side rails and a platform floor located between the first and second side rails; and (ii) first and second platform handrail assemblies respectively located on opposite first and second lateral sides of the platform. The stair assembly is connected to the platform to provide access to the platform and is movable relative to the platform from a first operative position in which the stair assembly projects outwardly away from the platform to a second stowed position in which the stair assembly is retracted relative to the platform and at least part of the stair assembly is supported adjacent the platform. The first and second platform handrail assemblies are each selectively configurable to be in: (i) an operative position in which the first and second platform handrail assemblies project respectively upwardly from the opposite first and second lateral sides of the platform; and (ii) a stowed position in which the first and second platform handrail assemblies engage both the platform and the stair assembly to capture and retain the stair assembly in its stowed position.