A safety trailer including first and second platforms, at least one of said first and second platforms having an axle and wheels attached thereto; a plurality of interconnected wall sections positioned between and connected to the first and second platforms, the plurality of wall sections defining a protected work area on a side of the trailer; and wherein each wall section has a lower bracing section comprising a single horizontal beam, two diagonal braces and a plurality of cross-braces, to allow workers in the protected work area to access a portion of the area under the wall section.

A socket mounted post system including a post with a hollow base portion attached to a spring mechanism. The spring mechanism includes a pillar, the pillar having a finger extending from the hollow base portion. The finger is engageable with a socket that is mountable in a floor. The spring mechanism allows the post to flex angularly relative to a vertical orientation of the post.

A safety trailer including first and second platforms, at least one of said first and second platforms having an axle and wheels attached thereto; a plurality of interconnected wall sections positioned between and connected to the first and second platforms, the plurality of wall sections defining a protected work area on a side of the trailer; and wherein each wall section has first and second end members, each of the first and second end members comprising an outwardly projecting alignment member and an alignment-receiving member, the first and second end members having the alignment and alignment-receiving members positioned in opposing configurations.

Retroreflective articles comprise a substrate and a bar code provided on the substrate. The bar code comprises at least one human-readable information which provides framing information and a machine-readable information which provides variable information. The human-readable information is visible under a first condition and invisible under a second condition, and the machine-readable information is invisible under the first condition and visible under the second condition.

Retroreflective articles comprise a substrate and a bar code provided on the substrate. The bar code comprises at least one human-readable information which provides framing information and a machine-readable information which provides variable information. The human-readable information is visible under a first condition and invisible under a second condition, and the machine-readable information is invisible under the first condition and visible under the second condition.

A bollard sleeve with a removable or replaceable cover is described. In one example, the bollard sleeve includes a cover portion and a sleeve portion coupled to the cover portion. The cover portion can have a cover removably coupled to a skirt, and the sleeve portion can have a tab. When the tab is in a first position, the tab can prevent the cover from being removed. When the tab is in a second position, the tab can form an opening that allows the cover to be removed. The tab can be bent from the first position to the second position, or the tab can be removed from the sleeve portion.

A bollard sleeve with a removable or replaceable cover is described. In one example, the bollard sleeve includes a cover portion and a sleeve portion coupled to the cover portion. The cover portion can have a cover removably coupled to a skirt, and the sleeve portion can have a tab. When the tab is in a first position, the tab can prevent the cover from being removed. When the tab is in a second position, the tab can form an opening that allows the cover to be removed. The tab can be bent from the first position to the second position, or the tab can be removed from the sleeve portion.

Retroreflective articles comprise a substrate and a bar code provided on the substrate. The bar code comprises at least one human-readable information which provides framing information and a machine-readable information which provides variable information. The human-readable information is visible under a first condition and invisible under a second condition, and the machine-readable information is invisible under the first condition and visible under the second condition.

Retroreflective articles comprise a substrate and a bar code provided on the substrate. The bar code comprises at least one human-readable information which provides framing information and a machine-readable information which provides variable information. The human-readable information is visible under a first condition and invisible under a second condition, and the machine-readable information is invisible under the first condition and visible under the second condition.

A sign assembly (2) for use on a road (8) has a support (6) arranged to be secured to the road (8) and a sign (6) configured to be detachably coupled to the support (6). The sign (6) has a non-planar portion is received in a slot (26) formed in the support (6). The assembly (2) is arranged so that the sign (4) returns to a standing position after impact while the support remains secured to the road and the sign (4) remains coupled to the support (6).