A bollard system including a bollard, a carrier device having a recess adapted to carry the bollard in a stowed configuration, a pivot rod fixedly secured to the bollard and received by a pivot carrier of the carrier device, wherein the bollard is adapted to rotate about a longitudinal axis of the pivot rod between a deployed configuration and the stowed configuration, a lock plate adapted to be received by the carrier device to maintain the bollard in the deployed configuration, and a cover plate carried by the carrier device and adapted to cover at least a portion of the recess of the carrier device in both the stowed configuration and the deployed configuration.

A bollard system including a bollard, a carrier device having a recess adapted to carry the bollard in a stowed configuration, a pivot rod fixedly secured to the bollard and received by a pivot carrier of the carrier device, wherein the bollard is adapted to rotate about a longitudinal axis of the pivot rod between a deployed configuration and the stowed configuration, a lock plate adapted to be received by the carrier device to maintain the bollard in the deployed configuration, and a cover plate carried by the carrier device and adapted to cover at least a portion of the recess of the carrier device in both the stowed configuration and the deployed configuration.

A warning structure includes a bracket and a warning member mounted on the bracket. The bracket includes a main body, rollers rotationally mounted to the main body, and a stopping assembly including a rotating mechanism and a stopping member coupled to the rotating mechanism. The rotating mechanism is rotationally coupled to the main body. One of the rollers is mounted adjacent to the stopping member. When the rotating mechanism is rotated, the stopping member is engaged with a ground to prevent the bracket from moving.

A warning structure includes a bracket and a warning member mounted on the bracket. The bracket includes a main body, rollers rotationally mounted to the main body, and a stopping assembly including a rotating mechanism and a stopping member coupled to the rotating mechanism. The rotating mechanism is rotationally coupled to the main body. One of the rollers is mounted adjacent to the stopping member. When the rotating mechanism is rotated, the stopping member is engaged with a ground to prevent the bracket from moving.

A bollard system includes a post extension to extend upward from a floor, a first collar to encircle the post extension, a first connector to encircle the post extension adjacent to the first collar, and a first handrail to be connected to the first connector. The bollard system includes a second connector to encircle the post extension adjacent to the first connector, a second handrail to be connected to the second connector, and a second collar to encircle the post extension adjacent to the second connector. The first collar is invertible selectively to a first lock position and a first release position, the first connector having greater freedom to rotate relative to the first collar when the first collar is in the first release position than when the first collar is in the first lock position.

A bollard system includes a post extension to extend upward from a floor, a first collar to encircle the post extension, a first connector to encircle the post extension adjacent to the first collar, and a first handrail to be connected to the first connector. The bollard system includes a second connector to encircle the post extension adjacent to the first connector, a second handrail to be connected to the second connector, and a second collar to encircle the post extension adjacent to the second connector. The first collar is invertible selectively to a first lock position and a first release position, the first connector having greater freedom to rotate relative to the first collar when the first collar is in the first release position than when the first collar is in the first lock position.

A warning structure includes a bracket and a warning member mounted on the bracket. The bracket includes a main body, rollers rotationally mounted to the main body, and a stopping assembly including a support member, a mounting member, and a resilient member. The support member is coupled to the main body. The mounting member is movably mounted to the support member. The rollers are mounted to the mounting member and the main body. The resilient member elastically resists the support member and the mounting member to bias the mounting member. When the support member is subjected to a downward force, the support member abuts against a ground to keep the bracket stationary.

A warning structure includes a bracket and a warning member mounted on the bracket. The bracket includes a main body, rollers rotationally mounted to the main body, and a stopping assembly including a support member, a mounting member, and a resilient member. The support member is coupled to the main body. The mounting member is movably mounted to the support member. The rollers are mounted to the mounting member and the main body. The resilient member elastically resists the support member and the mounting member to bias the mounting member. When the support member is subjected to a downward force, the support member abuts against a ground to keep the bracket stationary.

A warning structure includes a bracket and a warning member mounted on the bracket. The bracket includes a main body, rollers rotationally mounted to the main body, and a stopping assembly including a rotating mechanism and a stopping member coupled to the rotating mechanism. The rotating mechanism is rotationally coupled to the main body. One of the rollers is mounted adjacent to the stopping member. When the rotating mechanism is rotated, the stopping member is engaged with a ground to prevent the bracket from moving.

A system including a plurality of warning devices (100) each with a radio transmitter (111) and a positioning system (109). Each warning device is arranged to communicate with at least one other of the warning devices so that at least one of the plurality of warning devices can determine the mutual positions of the plurality of warning devices, determine a pattern from the mutual positions and transmit a specific message corresponding to the pattern.