An apparatus having a damper mount device for holding a damper element being operable for dampening a mast arm structure harmonics or bounce by creating a wind vortex when interacting with wind. An extension member component extends the damper mount device above a mast arm structure onto which the damper mount device is installed into. A damper bracket assembly being configured to hold the damper element with an attachment means. A strap adapter assembly being configured to attach the damper mount device onto the mast arm structure. An adjustment ball implement being configured to form a ball-in-socket implement operable for a rotational adjustment or tuning of an orientation of the damper mount device and the damper element.

A swivel mechanism for a rotating cantilever post including a cantilever boom and a post, the swivel mechanism comprising at least one first gear associated with the cantilever boom and at least one second gear rotatably mounted to the post, wherein the at least one second gear is operatively associated with the at least one first gear such that rotation of the at least one second gear causes rotation of the at least one first gear, rotating the cantilever boom relative to the post.

The structure (10) of light display for vehicle traffic lane(s) is of the type including at least one vertical support post (7), a substantially horizontal crossbar (3) fixed high to said at least one support post (7) and a variable-message light display panel (2) fixed to said crossbar, said display panel (2) having a front face on which the light messages are broadcast, and a rear face, said display panel being elongated along the crossbar (3), parallel and fixed to the latter, said structure including an autonomous electric power supply source comprising at least one photovoltaic panel (1). The photovoltaic panel(s) (1) are arranged towards the top and the rear of the display panel (2), in a plane that is horizontal or, preferably, inclined but not vertical, carried by a horizontal line parallel to the crossbar (3) and to the display panel (2), the front end(s) of the photovoltaic panels (1) being placed substantially against the upper end of the display panel (2), the front end(s) of the photovoltaic panels (1) being higher than the rear end(s) (12) of said photovoltaic panel(s) in the case of inclined photovoltaic panels.